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Old 12-21-02, 04:20 PM   #1
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Calling all AMD overclockers...I have questions.

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?
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Old 12-21-02, 05:30 PM   #2
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http://forum.oc-forums.com/vb/showth...hreadid=144965

http://forum.oc-forums.com/vb/showth...hreadid=113773
Quote:
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
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Old 12-21-02, 05:41 PM   #3
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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.
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Old 12-21-02, 07:25 PM   #4
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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
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Old 12-22-02, 01:07 AM   #5
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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
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Old 12-22-02, 02:04 AM   #6
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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.
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Old 12-22-02, 02:35 AM   #7
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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...
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Old 12-22-02, 12:01 PM   #8
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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.
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Old 12-22-02, 12:37 PM   #9
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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?
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Old 12-22-02, 12:45 PM   #10
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Stupid question. I thought AMD locked the multiplier on their CPUs. Did you have to hack the CPU to unlock the multiplier?
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Old 12-22-02, 12:56 PM   #11
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Some cpus do have to be unlocked, see my first link on how to do so.

Yeah. X, did you have to unlock it?
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Old 12-22-02, 01:00 PM   #12
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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.
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Old 12-22-02, 01:12 PM   #13
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That's a neat feature. I didn't know they have MBDs like that.
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Old 12-22-02, 01:13 PM   #14
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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?
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Old 12-22-02, 01:26 PM   #15
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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.
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Old 12-22-02, 01:54 PM   #16
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Is that 45C in idle or in stress load?
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Old 12-22-02, 01:59 PM   #17
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Idle. I just got it up to 57 during a burn-in test! But then it came right back to 45.
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Old 12-22-02, 02:24 PM   #18
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That's a HUGE jump. Mine is 49 - 53C
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Old 12-22-02, 02:36 PM   #19
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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.
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Old 12-22-02, 03:33 PM   #20
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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.
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Old 12-22-02, 08:37 PM   #21
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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.
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Old 12-23-02, 01:48 AM   #22
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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.
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Old 12-23-02, 01:57 AM   #23
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Quote:
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.
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Old 12-23-02, 02:20 AM   #24
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Quote:
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

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.
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Last edited by gcribbs; 12-23-02 at 02:41 AM.
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Old 12-23-02, 02:48 AM   #25
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Oh. Oops, wrong smilie!

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.
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