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New Processor Underclocked

Old 09-16-05, 12:33 AM
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New Processor Underclocked

I just bought a new AMD XP 2800 off of Newegg and just plugged it into an old ECS K7S5A. However, while booting, it said it was an XP 1900 and an unknown core.

So I downloaded CPU-Z and it reports it as an XP 1900. Apparently, it's running on a 200 MHz bus instead of 266 like the ECS should be running at.

It's been a while since I worked with a computer using SD RAM, so I'm not quite sure what's going on...

Do I need 266 MHz memory in order to bump up the processor? I'm currently only running paltry PC100. If I can get a bump up to 2800, I'll just go buy some DDR RAM (the board can handle either).

Any ideas? Thanks
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Old 09-16-05, 12:36 AM
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Can that motherboard run that fast an FSB?

I don't think your PC100 is going to cut it anyway. Although I've had some success in running PC100 at PC133 speed, it was in P3 systems, not newer ones. I'm not sure its timings can handle the double rate.
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Old 09-16-05, 12:37 AM
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http://www.ecsusa.com/products/k7s5a_pro.html

Processor

* AMD® Athlon XP / Athlon / Duron CPU
* Socket A
* 266 / 200MHz

Main Memory

* 2 DDR DIMMs
* Supports DDR266 / DDR200
* 2 SDRAM DIMMs
* Supports PC133 / PC100
* Max. 1GB (DDR SDRAM or SDRAM)

Figure PC133 will allow 266? Or DDR266 allows 266 FSB?
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Old 09-16-05, 12:38 AM
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Yeah, I have one of those but it has a 1700 in it and I haven't really considered putting any faster CPU in it.

Hmm, it says USB 2.0. I was only getting USB 1.1 with Win2K.
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Old 09-16-05, 12:40 AM
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I'm not sure but I think you need DDR to be able to handle the double data rate of the 266.

Looks like the 2800 needs a 333MHz FSB. Oh, you probably got the 266MHz version.
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Old 09-16-05, 12:57 AM
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The Athlon XP 2800+ uses a 333 mhz bus, not 266 mhz. The fastest Athlon XP that uses the 266 mhz bus is the 2400+ (or a mobile Athlon XP 2600+). I believe it will report as an Unknown Core because the K7S5A didn't officially support the "Barton" core that added extra cache.

I had that motherboard for quite some time and went through quite a few upgrades. You won't be able to reach the default 2800+ speed since the motherboard does not support the 333 mhz FSB. The multiplier for your CPU is 12.5 x 166 = 2083 mhz (2800+) The most you would be able to reach is 12.5 x 133 = 1666 mhz. I guess that technicall should have been detected as an XP 2000+ though, since the 1900+ is actually 1600 mhz. Odd. I'm not too sure on the that, maybe someone else can clarify or correct me.

Although if it's being detected as a 1900+, I would assume that the RAM and FSB may already be running at 133 (266) mhz?
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Old 09-16-05, 01:01 AM
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Originally Posted by fumanstan
The Athlon XP 2800+ uses a 333 mhz bus, not 266 mhz. The fastest Athlon XP that uses the 266 mhz bus is the 2400+ (or a mobile Athlon XP 2600+). I believe it will report as an Unknown Core because the K7S5A didn't officially support the "Barton" core that added extra cache.
The 2800 was a strange one, had both FSBs.

http://www.newegg.com/Product/Produc...82E16819103508

Read the first review.
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Old 09-16-05, 01:01 AM
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From Newegg:

AMD Athlon XP 2800+ 266MHz FSB Socket A Processor - OEM
http://www.newegg.com/Product/Produc...82E16819103508

Core Barton
Name Athlon XP 2800+
Operating Frequency 2.083GHz
FSB 266MHz

That's just what Newegg is telling me.

Here's what CPU-Z is telling me:
1600MHz
Multiplier x16, FSB: 100, Bus Speed 200MHz
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Old 09-16-05, 01:10 AM
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Looks like the K7S5A tops out at at a 2600+. Even the Pro version.

http://www.ecsusa.com/downloads/down...to=Motherboard

Select Socket 462.
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Old 09-16-05, 01:45 AM
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Wow, that's really odd. I remember doing a lot of research on supported chips when I was using my K7S5A too in order to find the best CPU for it. I could swear it was a 266 mhz FSB version of the 2600+ that was difficult to find since all Barton cores released were supposed to use a 333 mhz FSB, outside of the mobile chips.

Regardless, that does make sense I suppose, as I remember that motherboard would always default to the 100 mhz FSB after reseting the CMOS. Do you have the option to set that FSB/RAM speed in your BIOS? I always used a modded BIOS to add overclocking features, so I don't recall what the official BIOS options included. If so, it wouldn't hurt attempting to switch the FSB to 133 if possible and see if you have any stability issues with it.
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Old 09-16-05, 08:57 AM
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The BIOS is really limited, but it does look like you can step it up to 133/133 or 166/133 or something like that. I tried 166/133, but it didn't work (as I obviously don't have the right hardware). I'll see if Frys has any cheap DDR 266 this weekend and if not, I'll just get some from Newegg.
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Old 09-16-05, 09:07 AM
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Well, I clocked the CPU and the DRAM at 133/133 (166/133 wouldn't boot) and it seems stable. I'm getting about 2100 MHz now with 133x16 and CPU-Z is reporting the chip as a 2600 (which isn't quite 2800, but will do).

Thanks guys for your help. I had wanted to put a few more MB in the RAM, so I'll get 512 soon at DDR266 or higher. Then maybe I can clock it to 166/133.

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AMD XP64 3700, Sempron 3000, Athlon 1200, Athlon 1100, Duron 850, and now AMD XP 2800/2600
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