Passive cooling Pentium III 800

CPU Cooling tricks and techniques.

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Passive cooling Pentium III 800

Postby Half-Saint » Sun Mar 08, 2009 12:17 pm

Hey! I want to passively cool my Pentium III 800 rig. For this purpose, I bought a Zalman CNPS-6000 copper heatsink. Last night I tested the temps (from BIOS) and they were 48C stable. However, I decided it would be a good idea to clean the heatsink so I soaked it in vinegar-water solution for about 2 hours to remove the oxide. The problem is, the temps are now even higher than before! BIOS is reading 58C at idle and the board is not even mounted inside a case! What the heck?

Also, I just noticed that the HS is not sitting completely level on the core. It looks like one corner is slightly more pushed down than the other three. I haven't noticed this before as I wasn't paying that much attention. How can installing a Socket 370 heatsink go wrong :P Maybe the core is not in good contact with the heatsink... but it was good last night? How did this happen and what should I do? Maybe I could insert something between the CPU and the heatsink to even the pressure?

Thanks,
SainT
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Postby evasive » Mon Mar 09, 2009 2:47 am

Silly questions:

Did you apply a thin layer of heat-conducting paste between CPU and cooler like you should have?

Are you sure you mounted the heatsink the right way around and in the middle of the CPU?
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Postby Half-Saint » Mon Mar 09, 2009 5:18 am

Yes, I'm using Arctic Silver 3. The heatsink bottom is all flat and can't be mounted any other way AFAIK since it uses a clip. This is the heatsink I'm talking about: http://zalman.co.kr/ENG/product/Product ... sp?idx=272

I did notice that the motherboard is a bit bent. Maybe the socket got a little deformed as a consequence because it takes a bit of force to insert the CPU eventhough this shouldn't be the case with ZIF sockets!

Anyway, last night I decided to mount the mobo inside a midi tower case. I also undervolted the CPU to 1.6V. The only fan is the one in the PSU and the temps are now 41C for the CPU and 33C for the case which I think is quite good considering the fact that they were reaching 39C idle for the CPU with stock cooler at default voltage.

I'll probably leave it at that.

Cheers
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