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Cooling The Cache !
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Date: Dec 14, 2001
Section:Misc
Author: HH Editor
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Cooling The Cache ! - Page 1
 

Cooling The Cache !

Decapsulating the P2 and delivering a cool breeze over your cache!

 
I got a little bored Saturday night and decided to "pull a Kyle" on my Pentium 2-333. This was a serious leap of faith in that this processor already does 500+ Mhz. very stable on most BX motherboards. I really didn't have a lot of motive to try to cool my CPU anymore because of this. However, like I said, I was in between hardware reviews and I was bored! Idle hands make the devil's work... At least that's what my Mother always says! :-)

One of the most prominent issues with stability of an overclocked P2 is actually the performance of the on board cache, which most often times can't keep up with the higher end CPU cores. This chip actually has Toshiba 225 Mhz. Synchronous SRAM Cache on the P2 module which is faster than most P2s of the '98 vintage. These parts are set up to run pretty fast and as a result need to be cooled as well! Intel's design doesn't really provide decent thermal conditions for the on board cache of the P2. How do I know all this? I took the P2 Slot 1 Cartridge apart of course! This isn't an easy task! Don't even THINK of trying this yourself unless you know exactly what you are doing. Unless of course you don't mind a nice expensive P2 Coaster for your beverage after your attempt! Check this
link at The Heat sink Guide for a quick "how to".

So here is what a P2 looks like after case removal...

OK from left to right you're looking at a P2 with the case removed and the backing plate still attached. I have it sitting in a couple of Slot 1 Motherboard Guides just to keep it upright. The metal and plastic tabs at the bottom are not part of the processor. On the left, you can see pretty clearly where the P2 makes contact with the Heat Transfer Plate. Only the Processor Chip in the middle contacts the plate. If you look closely at this picture you can see the SRAM chips on either side of the CPU. They are obviously not making contact and therefore heat is not transferring from them to the plate. My buddy Kyle at "Da Hard OCP" decided he would bridge the gap with a nickel. This should work pretty well in conducting heat to the plate. However, in order to do this, you need to remove the plate and sandwich the nickels in between the SRAMs and the plate with thermal grease, to do it right. To remove the plate you need to remove the clips you see in the next image. These actually hold together the Module Board and Heat Transfer Plate. They are EXTREMELY difficult (although I have done it before) to get off, so I decided to do something different but effectlive.
 

Below are pictures of the de-capsulated processor with Heat sink and Fans attached.

I know it is hard to see because the rig is almost totally covered in fans! What you are seeing is another set of Dual 5000 RPM Fans blowing air down through the plate and CPU Module Board! This delivers a sweet, cool breeze to the SRAM chips as well as the standard plate cooling effect of the main Heatsink and Fan combo! It also does blow air over the CPU chip.
 
Doing this allowed me to get 525 Mhz. out of this great hand picked CPU for hours on end without a single lock up! Again, if you try this method yourself, you are on your own! I am not responsible for any damage you may cause to your system or processor! It works really well if you are the daring type!
 
Keep on clockin'!
-Davo
 
 


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