Help Overclocking a P3

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Archer01

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Jul 10, 2001
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I'm working on overclocking a P3 Coppermine 650mhz/100Mhz FSB. I've been able to get my FSB up to 130mhz with no stability problems in games or Prime95. However as soon as I go up to 133 on the FSB, Prime95 starts reporting an error on the torture tess after less than a minute but most of my games still play just fine or with very occasional video artifacts but no crashes. There is no temperature difference between 130 and 133 mhz speed. It goes from 35c idle to 58c full load. I've run the voltage up to 1.9v from 1.65v and that seems to have no effect. Just wondering if I should be worried. Have I missed something? Anybody know how to get this test to run properly. Here are my system specs.

P3 650mhz Coppermine (100mhz FSB) SECC2
Cooled with (GlobalWIN VOS32)
ASUS P3V4X Mobo
2 256MB OCZ PC150 Cas2
ELSA GeForce2 GTS
SB Live (Not 5.1)
NetGear NIC
 
Your problem is HEAT, these things loose stability around 55C when overclocked! Get a VolcanoII or Evercool ND-8 from <A HREF="http://www.nexfan.com" target="_new">http://www.nexfan.com</A>

What's the frequency, Kenneth?
 
Are you sure it's the heat? The CPU runs at petty much the exact same temp at 130mhz or 133mhz. Also it's a SECC2 proc so I can't use either of the HSF you recommended. That's why I'm useing the GlobalWIN HSF.
 
Your already past the threshold temp. Sorry, I forgot you were using SECC2, it's harder to find a cooler for that, but still possible, look for a dual fan unit with lots of fins and good construction. If you can't find that, the big SECC2 ORB MIGHT do, or you can try putting a better fan on your stock cooler.

What's the frequency, Kenneth?
 
Probably SECC2 is what is holding you back! Try increasing the voltage still further if possible, long conductors on the SECC2 tend to introduce EMI that affects the signal integrity. 2.0V or 2.1V should help. That wil of course, increase the temperature which might as well contribute to other problems!

I have P-III 600 runnning at 60°C or more all the day at a ambient of 30°C or more, so I dont think it is particularly a temperature issue. P-III core is rated for 70°C and 90°C for slot1. Still, if you find a better cooler try it.

girish

<font color=red>No system is fool-proof. Fools are Ingenious!</font color=red>
 
My PIII (700E) oveclocked will always start crashing apps at 63 degrees. Total lock up soon after. 70 degrees rating is stock don't forget, the hotter the chip, the less you can overclock. Eventually the temperature goes past your NEW threshold and pip - out go the lights.

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Either you have an extremely heat-stable CPU, or your temp monitor is wrong. I've never seen an overclocked PIII hit 60C before it locked. All of mine lock between 50C and 60C, depending on how far they are overclocked.
Higher voltage does raise heat tolerance, I can overclock 700@933/1.65v at 40C, but need 1.70v at 45C and 1.75V at 52C. At 55C, more voltage doesn't help, it still locks up. Similar results with my other processors.

What's the frequency, Kenneth?
 
Well, on further research I found that the probe on asus boards run 5C higher then they really are so that probably accuonts for the error. No higher voltage helps I think I need to mess with the ammount of thermal grease I have between my core and my HSF. Maybe Lap the core as well. I'm kind of reluctant to do that though.

Does anybody else have experience with the GlobalWIN Vos32? It seems to me the base plate of this unit is petty thick. I was wondering if Grinding it down so the base was thinner would help. It seems to me that if I did the Core would be closer to the cooling fins of the heat sink. Less material for the heat to transfer through and subsequently cool faster. Also thought about sanding the place where the Heat sink touches the core. It seems pretty rough to me. It was just a thought.
 
Not sure - I have MBM (unadjusted) on a CUV4X (Via).

Currently running @933 (was hitting 62 degrees reported at 1036, where it got unstable) Usually up around 50-55 semi loaded.

It only has a tiny radial fin cooler since the system is in my living room as an AV machine - noise was more important than the cpu life..

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i wouldnt lap the cpu core....kinda dangerous...
lapping the hsf might help.
there are a few guides to do that around on the internet...
people have reported pretty signifigant temp drops through lapping...
and when it comes to thermal grease...
put a little on the hsf, and rub it into the base.
that will make sure that the gaps and valleys in the hs base will be filled.
then put a thin layer on the core, spreading it with an old credit card.
then install it all, and dont move the hs once it is on, or you should start over.
doing this will ensure that just enough thermal grease is inbetween the hsf and core to fill the air gaps.
more than that actually impedes the heat transfer.
less than that might not fill in the gaps.
a good guide, which i think is pretty good is on arctic silvers site.
<A HREF="http://www.arcticsilver.com/arctic_silver_instructions.htm" target="_new">http://www.arcticsilver.com/arctic_silver_instructions.htm</A>

-DAvid

-Live, Learn, then build your own computer!-
 
I was using the retail that came with the 733 it replaced, but definitely not up to the job. This isn't too bad, copper core and all, and totally silent (I could still hear the Intel retail fan whining away).

Thanks for the idea though. I would cool it better but it is in a micro-tower and the PSU is mounted 90 degrees and so physically above the socket. Usually I now tend to put excessively large heatsinks and slow fans on things, but there just isn't room in this sucker...

Like I said, it runs fine, 24x7 at 933. It's hot, but if it fails, I get an excuse to upgrade again! :smile:

-* <font color=red> Under Offer </font color=red> *-
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Ah - uh, okay. You're not going to let this go until I agree to put a better heatsink on this thing and stop torturing it are you? :smile:

-* <font color=red> Under Offer </font color=red> *-
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