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View Full Version : Calling all AMD overclockers...I have questions.


X
12-21-02, 05:20 PM
I was playing with overclocking my XP 2400+ CPU on an Asus motherboard. My RAM is very overclockable and the video card should be as well.

So far I can only get the multiplier up to 16 (instead of 15) resulting in 2.13GHz (instead of 2.00GHz) and remain absolutely stable. I had to increase the voltage from 1.65 to 1.70 to do this.

I had some success at a 16.5 multiplier at 1.825 volts but it wasn't absolutely stable (although it ran impressively fast and relatively cool at at 42-43 until it blue-screened). I've also played around with leaving the multiplier the same or lowering it and raising the FSB but it seems I can't get quite as much speed out of it that way while maintaining stability. I could only get up to about a FSB or 147-149. Do you need to do something different when you hit FSB 150? The BIOS warns about the RAM speed setting and then seems to be satisfied when I chose one it suggests, but it seems to make a big difference to it when I hit 150. The RAM speeds stop incrementing automatically at that point.

I've tried raising the RAM and video voltages and upping (or lowering, depending on how you look at it) the RAM settings from 2-2-2,1T to 2.5-3-3,2T which should be ok (it's Corsair PC3200-CAS2). But it seems I just can't stability at 10% or more overclocking. The Antec 350-watt PS seems fine, the voltages appear to hold up during all this and the CPU gets correspondingly hotter. But never over 50.

I'm completely new at this. Any tips?

Ranger
12-21-02, 06:30 PM
http://forum.oc-forums.com/vb/showthread.php?s=&threadid=144965

http://forum.oc-forums.com/vb/showthread.php?s=&threadid=113773
The default vcore on amd athlon cpus is 1.75v. If you keep your voltage at 1.75v you will NOT be able to get that high of a overclock. maybe only 50mhz...

Raise your voltage as your cpu gets unstable. For example. If you have a 1900+ AMD Athlon (1.6ghz Clock Speed) then with 1.75v you may only be able to run your computer stabily with the FSB at 138. After you find that out, bump the voltage up to 1.775v and then see how high a fsb you can have. Continue going on until you have either maxed out your cpu or it is getting to hot (over 50c)...

The same thing goes for the voltage that you feed your ram. The default vdimm is 2.5v (or 2.55v depending on your mobo). if raising your cpu voltage does nothing to your overclock try raising your mem voltage and there is a high chance that will make it be stable. Now you dont want to kill your ram so in my personal experience the highest SAFE voltage to use on your ram is 2.8v
...
The max aggressive settings are different on some mobos but generally it is the same. Cas 2.0 4bank then configure 2-5-2-2-1t command. I am sorry i forgot the actual names of the numbers. However, just lower the settings to the lowest numbers and that is always the most aggressive. Well you may ask why i would do this? doesnt it generally give you less mhz? well yes it does. However, if you run your memory at a faster speed but have your cpu 50mhz lower than it can possibly go, it may be faster in many benches still

X
12-21-02, 06:41 PM
Thanks for the references!

I did really raise the voltages, up to 1.85 for the CPU, I forget where for the memory, but several steps above its default. And I still wasn't getting much of anywhere on the FSB. But I'll try again when I get some time. The constant booting/bombing/booting/testing/bombing in Win2K Server takes a long time.

BTW, the 2400's vcore is 1.65. It's a newer generation of .13 micron die CPU.

zuffy
12-21-02, 08:25 PM
I know in my Abit MBD, the BIOS limited the PCI/AGP/FSB ratio to 4:2:1. Default value would be 33/66/133 for my Athlon XP 1900 but I set my FSB to 145 so that would translate to 36/72/145mhz. If the BIOS would offer a 5:3:1, I would boost the FSB more, but now I don't because I'm afraid my PCI peripherals will not like it.

Declaimer: I am fairly new at this since this is my only experience in OC'ing an AMD. You could say I might be talking outa my ass ;)

gcribbs
12-22-02, 02:07 AM
to get over 10% you will need a lot better cooling since you will have to push the voltages even higher more than likely.

The best overclocks are a combination of FSB with multiplier. so moving the multiplier to 16 from 15 and also moving the fsb up to 147.

What is the highest multiplier you have access to?

you might need to lower the fsb at first maybe even below 133. see what the highest multiplier you can get it to run at. then you will need to move the FSB up bit by bit. increasing volatages as necessary and watching temps.


Personally, If you can get the Mhz up around 10% from 2 Ghz to at least 2.25 Ghz you will be running your XP2400 at XP2800 speeds. Nothing wrong with this especially if you do not spend much to get it.

Also sometimes a cpu just does not overclock well :(

X
12-22-02, 03:04 AM
Thanks for all the help!

I followed the suggestions in one of Ranger's links and got up to 166 FSB with a 13 multiplier. Now I'm trying gcribbs' suggestions, which are in the direction I think I favor, and I'm at 16x and 135 FSB. I'd rather push the CPU more than the RAM and video so this might be a good approach. So far, so good.

I think my 39160 SCSI card has a problem with high FSBs. Most of my real obvious problems show as file read errors during booting. But since this is a VIA 400 board it goes from 1/4 to 1/5 for the PCI bus when you hit 166. That may be why I had trouble at 150, but 166 worked.

It does seem that higher voltages help. I'm at 1.80 now and the CPU temp is still only at 41. So far I'm about at the speed of a 2600+ which costs $80 more than my 2400+. Not bad.

Shuki
12-22-02, 03:35 AM
voltage and cooling are the key. and having a 5/2/1 divider option makes life really nice for breaking 170ish. The kr7a though has no problem even with the standard 4/2/1 divider but you said you had Asus. In my experience (a7v-133) the asus is not the best board for top OCing. It'll take you up a bit but to go the highest, I had to go abit. One reason though is that my a7v had no way to increase RAM volts (except physical volt mod on the board). I decided to start over again and ordered a kx7-333, xp1700 and a thermalright ax-7.

After unlocking my xp1700 (made to run 1463Mhz) I'm up to 1710Mhz sitting at 38c idle and 44 under full gaming load. I prefer high fsb rather than high multi so I run day to day at 190x9 (with the 5/2/1 divider kicked in). My cpu volts is at stock 1.75 and my DDR (2x256MB samsung pc2700) is at 2.75. I prefer the higher fsb because it causes my memory to perform so much faster and everything is just much more responsive. And I also can't stand loose mem timings so I stay as agressive as possible. I Actually broke 3k sandra mem benchamark at 2.5-2-2-1T timings at 200x8.5. I added another 256 stick though and it didn't like those aggressive timings together. To stay at 200 fsb I had to run 2.5-3-3-2. Preferred 2.5-2-2-1 so dropped back to 190x9 and thats where I've been for about 4 months now...

TheKobra
12-22-02, 01:01 PM
A little off topic. By bumping up 10% will you see anything? That is speed. I got my 1800XP only at 1.62. It will not boot if I set it higher. So 150mhz do you really see anything? That is really my question.

Ranger
12-22-02, 01:37 PM
Just curious, what kind you colling you have?

Hard drive? Cpu? Vid card? Extra case fans?

What are the dimesions of the heatsink and did you use thermal paste?

zuffy
12-22-02, 01:45 PM
Stupid question. I thought AMD locked the multiplier on their CPUs. Did you have to hack the CPU to unlock the multiplier?

Ranger
12-22-02, 01:56 PM
Some cpus do have to be unlocked, see my first link on how to do so.

Yeah. X, did you have to unlock it?

X
12-22-02, 02:00 PM
The Asus A7V8X unlocks the newest generation of XP chips (0.13 micron Thoroughbred) automatically. I have the XP 2400+ so it's automatic. Nice, huh?

If Ranger's question is for me...

Primary drive is a 10K RPM IBM SCSI driven by an Adaptec 39160 controller. Two IDE drives, 120 and 60GB WD 7200RPM's.

Video card is a 128MB Asylum GeForce4 Ti4200.

Front and rear case fans, stock AMD heatsink, Arctic Silver II paste.

zuffy
12-22-02, 02:12 PM
That's a neat feature. I didn't know they have MBDs like that.

Ranger
12-22-02, 02:13 PM
Ah, that's so cool about the automatic unlock feature from the mobo!

I mean do you have a hard drive and video card cooler? That vid card should have a fan on it already, is it plugged in?

I'm curious about how big the heatsink is, is the base about 80mm around?

X
12-22-02, 02:26 PM
The hard drives are no problem. They sit right in front of the front fan. Of course that contributes to overall heat, but the motherboard reports that it's only 29.

The video card has a big fan and I left the slot next to it open. It plugs into its own board and is plugged in.

The CPU heatsink isn't 80mm, I don't know the exact size of the stock AMD one. But temps aren't my problem yet. At 16x, 138 FSB (1.85-v CPU, 2.75-v RAM) the CPU is still at only 45.

zuffy
12-22-02, 02:54 PM
Is that 45C in idle or in stress load?

X
12-22-02, 02:59 PM
Idle. I just got it up to 57 during a burn-in test! But then it came right back to 45.

zuffy
12-22-02, 03:24 PM
That's a HUGE jump. Mine is 49 - 53C

X
12-22-02, 03:36 PM
I'm working on lowering the voltage. It was at 1.850, now it's at 1.825 and seems stable (42 idle). The max it got to during a burn-in was 51. Not bad. That extra .025 volts really made a difference.

The RAM is the thing that really likes the higher voltage. I have it at 2.85 now, 2.75 wasn't stable.

Ranger
12-22-02, 04:33 PM
Still sounds a bit too warm (you don't want it to be running over 40C all the time do you?) for me, why not ditch the stock heatsink fan and get an adaptor and an 80mm fan like Panoflo or the Vantech Stealth? The reviews are saying that the Stealth is only 21dBA and moves a lot more air than any crummy 60mm fans, I have this fan but I need to order a bigger heatsink next month so I can finally use it.

But of course, it'd be cheaper not to overclock but that's not an option here. :)

Xanager
12-22-02, 09:37 PM
I'm sort of new to the overclocking thing, and I have a few questions. I have a MSI nForce board w/ a 1600+ chip. I know this isn't the best board for OCing, but here are my options.

Right now I'm running at 133/266/66, and at default multiplier and voltages. In the BIOS I have the option to change the multiplier up to 12.5 (I don't know what the default is) and the voltages up 0.02, 0.05, or 0.10 V. I'm not looking for a massive OC, but I guess every little bit helps.

I built this computer back in January, and it was actually my first to build, so I just used the retail heatsink/fan that came w/ the chip. I run idle at about 42-43.

When I bump up to 145/290/72 I get like 1.53 gHz or something along those lines, and it idles around 46. I notice you talk about changing just the FSB, or the mem volt., etc. I can't change the mem volt in my BIOS. And, I can't just change the FSB alone. It changes the other two numbers as well. Is this a necessary? Do the Mem and AGP numbers vary accordingly w/ the FSB? btw, I haven't unlocked the XP chip. Is this necessary to change the multiplier?

I read the links to get some ideas, but my mobo does seem limited in the OC dept.

gcribbs
12-23-02, 02:48 AM
remember these athlons are multiplier locked so unless you either bought an unlocked one or unlocked it yourself(can be hard to do) changing the multiplier will not really cause your cpu to overclock.

My cpu is locked so I can only use FSB changes to overclock when it would be better to change the multiplier and also raise the FSB to really get a bigger overclock.

X
12-23-02, 02:57 AM
Originally posted by gcribbs
remember these athlons are multiplier locked so unless you either bought an unlocked one or unlocked it yourself(can be hard to do) changing the multiplier will not really cause your cpu to overclock. Better read a couple of posts above... :)

It is unlocked. I'm currently at 12.5 (of a 15 default) and have been up to 16.5. All automatic.

There are major changes in performance that I've noticed using different combinations of multipliers and FSB. I'll report on them soon. I'm very happy with 12.5x and 175 FSB right now.

gcribbs
12-23-02, 03:20 AM
Originally posted by X
Better read a couple of posts above... :)

It is unlocked. I'm currently at 12.5 (of a 15 default) and have been up to 16.5. All automatic.

There are major changes in performance that I've noticed using different combinations of multipliers and FSB. I'll report on them soon. I'm very happy with 12.5x and 175 FSB right now.

By the way I was responding to Xanager :o

X :

so you did not unlock yours?

mine acts like it is unlocked also. I can change the multiplier all I want.

It just has no effect on the actual speed that the cpu is running at. so 16 x133 is the same as 11x133

are you sure that the cpu is really unlocked?

Of course maybe the XP 2400 and above are different than the older larger die XP's.

X
12-23-02, 03:48 AM
Oh. -other- Oops, wrong smilie! :o

Oh yeah, I'm sure it's unlocked.

It is a function of the particular model of CPU and, I believe, to a lesser extent, the motherboard. It's so easy to do that I think most motherboards must do it. (At least the brands you'd want to use to overclock.)

There's a huge difference between any multiplier I use and the speeds and temps.

I've gots lots of post-its with results. Here's one. CPU at 16x, everything else the same (133 FSB, 1.85-volts, etc.) -- SiSandra CPU Arithmetic Benchmark of 7921/3222. CPU at 16.5 (ceteris paribus [hehe, been wanting to use that since econ school]) -- SiSandra CPU Arithmetic Benchmark of 8271/3323.

Shuki
12-23-02, 03:51 AM
Originally posted by X
stock AMD heatsink

yuck. as you know heat = enemy. I'm not saying this is causing your instability right now but the hotter the chip runs, the shorter its life becomes. The cooler you keep it, the longer it'll last you (provided of course you don't fry it, R.I.P. little t-bird.. *tear*). If you're serious about keeping and running an OCed rig, I'd really consider picking up a quality brand name hsf combo. I bought the thermalrigh ax-7 and an 80mm delta from newegg for like $25 or $30 shipped. Really a good choice.

X
12-23-02, 04:04 AM
I know, I know...

I'm just learning here and I don't want to spend any more money on this machine. It's a total budget job. And I'm more against enhancing it just for the difficulty of opening the machine than anything right now. It sits next to a server that I don't screw around with. Although I did open it today to make sure I wasn't burning up my $175 Corsair RAM by feeding it a too-rich diet of voltage. It was warm, but I wasn't burning it up -- I think. (BTW, damn good RAM! :up: )

I'm just trying to squeeze as much performance as I can out of stock AMD components. Heat hasn't been the big factor here yet (it's friggin' cold!), but I know it will be in the summer. So I'm also getting ready to accept what I'll have to in 6 months or so. And maybe I'll be spoiled enough to open up the case and put on another heatsink. Or buy a 2800+ for less than my 2400+ just cost and give the 2400+ to my son to replace his 1600+. We'll see.

Xanager
12-23-02, 11:15 AM
Originally posted by gcribbs
By the way I was responding to Xanager :o

X :

so you did not unlock yours?

mine acts like it is unlocked also. I can change the multiplier all I want.

It just has no effect on the actual speed that the cpu is running at. so 16 x133 is the same as 11x133

are you sure that the cpu is really unlocked?

Of course maybe the XP 2400 and above are different than the older larger die XP's.

I think this what mine does. I haven't unlocked it, but the BIOS allows for multiplier changes. I can change it all I want to, but it does nothing. I guess I'm stuck with just upping the FSB and voltage just a little bit.

Thanks for the reply gcribbs.

gcribbs
12-24-02, 01:37 AM
Originally posted by Xanager
I think this what mine does. I haven't unlocked it, but the BIOS allows for multiplier changes. I can change it all I want to, but it does nothing. I guess I'm stuck with just upping the FSB and voltage just a little bit.

Thanks for the reply gcribbs.

me too :)

I am not too upset since I get a performance increase without spending any money for it.

X:

I also go with stock cooling and figure any increase in speeds are a bonus.

good for you that your cpu is unlocked since you will get the best performance increases with an unlocked cpu. I may get myself that ASUS board since i think I like that feature. Plus i guess i would need to get a new .13 cpu also and new ram... :D

rpbrown
01-03-03, 04:19 PM
I agree with gcribbs. Unless you unlock your AMD it is physically locked to the clock speed for that chip. It is impossible for a MB to override that feature. You are stuck with your present clock mutiplier and therefore must increase the FSB to get any speed. However your RAM setting of 2T is going to limit you straight awayyou need more agressive setup there plus more volts to the AGP and RAM. Most T Breds or XP +'s can only get around 8-10% increase without physical alterations. See www.amdmb.com for a good place where you can pick up several tips from the hard core overclockers.

The best I can get out of my 2600+ is 16x145 which is 2320 and at that it is stable and runs a an idle temp of 29c and with full load 45c.

X
01-03-03, 04:25 PM
Originally posted by rpbrown
I agree with gcribbs. Unless you unlock your AMD it is physically locked to the clock speed for that chip. It is impossible for a MB to override that feature. You are stuck with your present clock mutiplier and therefore must increase the FSB to get any speed. I guess you better tell my unaltered 2400 that then. :) I've had it running from 8x to 16x, and of course the FSBs were correspondingly high to low depending on which multiplier I set it at. Right now I'm at 14x - 156FSB. The normal multiplier is 15.

As I understand it the T-Breds are unlocked by wiring a couple of pins together. The Asus boards can easily do that in their circuitry. And they do.

I'm also running the RAM at CAS2 and the fastest of all other settings. That's why I got the PC3200 for a few dollars more. I did up the voltage on it.

Oh, by the way, we have a 5 line maximum for signatures. Can you consolidate yours a little please?

X
01-13-03, 03:22 PM
Here's where I am and I have another question...

I'm running at 13x (default is 15x) multiplier with FSB of 166 (default is 133). So about an 8% gain over the default speed of 2.00GHz. The core temp runs about 48-51 for normal tasks. It can get to the high 50's when I do burn-in tests.

I don't really care about the chip's life as long as it's over a couple of years. I've read that running within 20 of its max rated temp of 85 could shorten its life to maybe 5-10 years.

My question is about cooling. I don't really want a different heatsink/fan than the AMD retail one I'm using now unless it would get me a lot more speed.

Right now I eventually bluescreen when I clock any higher and perform burn-in tests overnight. I don't think the core gets any higher than 60. Is merely the higher temperature causing the bluescreening? If I cooled the CPU even more would it be more stable? Or is further cooling only required for longevity of the CPU or running at much higher voltages (which may provide more stability)?

Ranger
01-13-03, 03:58 PM
Do you think AMD made those HSF, they figured it would do the job for overclocking? A stock HSF will work nicely as long its in an environment for what it was engineered to do so, FACTORY DEFAULT levels! A good HSF really isn't that much, i mean, its only like $5-20, for crying out loud. :) I'll check later for the recommended HSF that will provide better cooling and even quieter operation.

Your BSODs really can come from a number of things, from stressed out memory or mobo (More likely cases), CPU too hot (I think the mobo would pick up the heat and tell the computer to quit), some guys would say they'd get BSODs when OC'D but still when temps are OK, then there's also file corruptions.

Now, your tuen, which AMDs has the new microns that use less power? The 2000+ XP and up? Or... ???

X
01-13-03, 04:10 PM
The 0.13 micron Thoroughbreds are the ones that use less power. They're generally the newest 1700+ through 2200+. All the 2400+ and above are the new ones. The model number starts with "AXDA". The "B" models are the more overclockable versions compared to the "A" models.

Check this page - http://www.overclockers.com/tips00173/

Ranger
01-13-03, 04:29 PM
Thanks, more links an info from the overclockers gods at overclockers.com.


Lapping

Manufacture's don't have all day to make the base of the heatsink perfectly flat, the base is flattened by power tools such as machine grinders. Manufactures sometimes do a poor job of it and leave lots of sanding marks and a concave or uneven base. The uneven base creates less contact with the CPU. Lapping involves buying waterproof (Very important) sandpaper and using a flat surface such as glass and sanding down the heatsink to a flat base. Not only will a flat base improve your performance, but to remove the scratches so there will be contact within the base instead of none in between the scratches. Lapping can improve your temperatures from 2-5 degrees on average. Here's a guide written by Maximus Nickus:

http://www.overclockers.com/tips1015/

Ducting

Ducting is the process in which you have a fan which pushes more CFM on top of your CPU Fan. It draws cold air in or sucks hot air out and you create a tunnel from the fan to your fan area hence duct. It should drop your temps. Although I don't recommend it, many people still do it lowering their temps but I don't like it because it screws up my airflow. I prefer to add them to the bottom of the side panel or as blowholes since they look nice as well.

http://forum.oc-forums.com/vb/showthread.php?s=&threadid=128729

http://sound.westhost.com/heatsinks.htm

http://www.amdmb.com/article-display.php?ArticleID=105&PageID=6

http://forum.oc-forums.com/vb/forumdisplay.php?s=&forumid=6 Do some searches in this forum and you'll be swamped with info.

http://www.overclockers.com/articles373

gcribbs
01-13-03, 11:01 PM
Also some chips overclock better than others cooling or not. I would say that with better cooling you might get higher overclocks.

The key is do you want to spend the money.

when you say clock any higher do you mean bumping the multiplier up a bit while leaving the FSB the same. If so I would guess it is a heat issue or maybe a voltage issue.

If you mean go an even higher FSB I would suggest to try moving the multiplier up a half at a time while leaving the FSB alone and see how that goes.

Personally I would not increase the voltage a bunch with stock cooling so you really have no way to test that unless you really want to risk your CPU. If so let us know how it went :)

X
01-17-03, 01:26 PM
I seem to have hit the wall on stability under high stress. The temperatures are getting up there during tests (up to 60 for the core, over 70 for the motherboard right under the CPU) and I'm really curious about what would happen with better cooling. The system runs fine with a normal load and I can easily get it running even faster except when it's under stress. And under stress equals high temps.

So I bit the bullet and ordered a Thermalright SLK-800 with a Thermaltake smart case fan 2. Found a really good deal on it so I don't feel too bad throwing a little more money at the system. After all, I'm getting at least $100 more performance out of the CPU already.

gcribbs
01-17-03, 02:32 PM
Originally posted by X
I seem to have hit the wall on stability under high stress. The temperatures are getting up there during tests (up to 60 for the core, over 70 for the motherboard right under the CPU) and I'm really curious about what would happen with better cooling. The system runs fine with a normal load and I can easily get it running even faster except when it's under stress. And under stress equals high temps.

So I bit the bullet and ordered a Thermalright SLK-800 with a Thermaltake smart case fan 2. Found a really good deal on it so I don't feel too bad throwing a little more money at the system. After all, I'm getting at least $100 more performance out of the CPU already.

you should be far more stable. The CPU might or might not go higher on an overclock. The good thing is that with the better HS/Fan you should be able to inch up the voltage to the cpu to try and get a more stable and higher overclock :D

Of course then you might see a better overclock and decide with even better cooling you could get even more.

next stop water cooling, Peltiers, home built air conditioners ;)

http://forums.overclockers.com.au/forumdisplay.php?s=&forumid=24

X
01-17-03, 02:44 PM
Yeah, I was thinking about the voltage thing. I'm at 1.85 (although MBM says 1.90 so I better believe it). The CPU can take up to 2.00 so I figure I can add another .10 anyway. That might help.

I'm stopping at this heatsink. It's about the best one there is and I'm sticking an 80mm fan on it. I am not getting into water or N2.

gcribbs
01-17-03, 02:55 PM
ASUS has a tendency to slightly increase voltage going to the CPU. This helps them overclock better right out of the box.

X
01-18-03, 09:09 PM
Well, I guess a better heatsink and fan was needed...

AMD heatsink:
CPU - Idle: 48, Under stress: 60
MB - Idle: 60, Under stress 70

New heatsink:
CPU - Idle: 24, Under stress: 28
MB - Idle: 40, Under stress: 45

The HSF has a variable speed, this was at the top, and somewhat loud speed.

Not bad for about 8% overclocked. Now I'll see what that CPU can really do.

gcribbs
01-18-03, 09:47 PM
huh. sounds good.

Funny thing is that usually the cpu is hotter than the MB. Do you think you have the sensors backwards?

40 C seems real high for a MB/Case temp especially in SF this time of year :)

Mine right now is

31C case/MB
43C CPU

just wondering :)

Of course either way it looks like it made a huge difference and sounds like you can push it more :)

X
01-18-03, 10:24 PM
The MB that I'm referring to is the area right around the CPU. It always is hotter than the CPU from what I've read about this MB.

The actual overall MB is really only 24, which is pretty much ambient temperature. This is the one you call case/MB.

I've upped the FSB to 169 which is a 10% overclock and the temps under fairly heavy usage are 30 for the CPU, 49 for that MB area under the CPU. Not bad, especially considering that I really slowed down the fan. And it's stable.

gcribbs
01-18-03, 10:38 PM
Originally posted by X
The MB that I'm referring to is the area right around the CPU. It always is hotter than the CPU from what I've read about this MB.

The actual overall MB is really only 24, which is pretty much ambient temperature. This is the one you call case/MB.

I've upped the FSB to 169 which is a 10% overclock and the temps under fairly heavy usage are 30 for the CPU, 49 for that MB area under the CPU. Not bad, especially considering that I really slowed down the fan. And it's stable.

maybe try moving the multiplier up and keeping the FSB at 166.

Of course you might need more voltage for the CPU, but it looks like you can afford to do this :)

The temps confused me since my ASUS board has only two sensors case then CPU.

I am think of getting this motherboard and getting a new XP to play with.

You seem to be having fun and I think I need some fun right now :)

Maybe in Feb. when things slow down for me.

X
01-18-03, 10:43 PM
There are 3 sensors on the MB.

Right now I'm at 13x172. Best benchmark scores I've seen and still 28/49 (CPU/right under the CPU) with the CPU fan turned way down.

I have not touched voltage so this seems to be saying that the temps are a big factor, not the ability to pump more power in without burning it up.

gcribbs
01-18-03, 11:00 PM
Originally posted by X
There are 3 sensors on the MB.

Right now I'm at 13x172. Best benchmark scores I've seen and still 28/49 (CPU/right under the CPU) with the CPU fan turned way down.

I have not touched voltage so this seems to be saying that the temps are a big factor, not the ability to pump more power in without burning it up.

usually both. although lower heat can help a ton. at some point you will reach a point where instability starts happening that might be stopped by increasing voltage.

Of course so much is processor specific. If you get a great processor then you will get a huge overclock then the next person has the same processor that barely overclocks.

sometimes more voltage will help that person with a weaker processor get a slightly higher overclock.

You seem to have a great processor.

what is the highest multiplier you have?

X
01-18-03, 11:13 PM
It's taken me a while. I was pushing it too much. :D

I'll have to check what the highest multiplier is. It's probably over 18, I just haven't paid attention.

13.5x172, 13x177, 13.5x171, all didn't work. I can't raise the CPU's voltage without opening the machine and changing a jumper. I don't feel like opening it right now.

I'm at 13x174, 1.85 (really 1.90 volts core) 2.75 volts RAM. Upping the RAM voltage didn't seem to help.

I think I might be getting into a problem with the SCSI card being pushed too much when I go too high with the FSB even though it has a 1/5 divisor. I'm not sure if it can handle 35MHz and all the problems I have seem to be during boot disk access. I get errors like "file corrupted" or stuff like that.

I seem to be pretty much stuck at 2262MHz until I can up the CPU voltage. But that's not too bad for a 2000MHz CPU. I'm wiping out the 2600+ scores with a 2400+ that cost $100 less.

Ranger
01-18-03, 11:20 PM
Now I understand why overclocking can be so addicting to many. :D Nice work! Can't wait to build my AMD box in the Summer!

gcribbs
01-18-03, 11:22 PM
how about 14x 166
would get you to 2324 :D

Of course if you have run into a power issue then even higher multipliers will not help although they will reduce the stress on the devices on your Pci and Agp buses :)

X
01-18-03, 11:24 PM
:D

I just did some benchmarks. Seems I'm running at 2800+ speed. Makes sense since its clock speed is 2.26GHz and I'm running at 2.262GHz.

The temps are still really low too!

I can definitely notice a difference in the speed of the system. It is very snappy. A real improvement over the 2.158GHz I was at before.

X
01-18-03, 11:26 PM
Originally posted by gcribbs
how about 14x 166
would get you to 2324 :D I couldn't get a 13.5x171 before. So I'm going to wait until I open the case to change the jumper so I can get some more POWER!

gcribbs
01-18-03, 11:32 PM
cool. I am looking forward to how high you can get this CPU up to with just air cooling :)

Shuki
01-19-03, 10:27 AM
Attention men!!! if you can at all afford $100 for a new xp2100 tbred "b" core, they are hitting 2.3 and 2.4Ghz right from the box on air cooling!! water cooled rigs are breaking 2.5+.

Got mine on its way from newegg.com. $100 for xp3200+ speed!! you gotta LOVE AMD :D :D :)

Darren Garrison
01-19-03, 11:10 AM
You know, it doesn't sound like much speed now, but I once had a Pentium 75Mhz that I overclocked to 100Mhz with air cooling. If only today's chips could overclock by 33% like that! It even booted at 120, but was unstable. I can't wait to see if I can squeeze anything out of the 333MHz FSB 2600+ I have ordered, now that I know my MoBo can change the multipliers without modifying the chip itself.

Shuki
01-19-03, 11:55 AM
I'm telling you, these new tbred "b" cores are great. They are in fact hitting 33% OC on air. Default is 1736Mhz. a 33% increase would be 573Mhz totalling 2309Mhz. They are hitting that right out of the box still locked with only fsb OC (13x178)!!!! Provided of course your mobo, ddr and other peripherals can handle that higher fsb... I'm really excited! Silly to spend BIG money on xp2400 or xp2600 when $100 xp2100 "b" is performing just as well :D

X
01-19-03, 07:42 PM
I upped the voltage to 2.03-2.05. That made it stable at 13x178 which translates to 2.314GHz. Not bad for a 2.000GHz chip, it's wiping out a 2800+ in benchmarks now. I'm not sure I want to push it any more.

The CPU temp is 34 idle, 42 under stress and I have the CPU fan running under 3000RPM. At 4000RPM it lowers the temp substantially, but it's loud.

I found out the particular stepping of my CPU is the worst one. The other two steppings are much better for overclocking. :eek: