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As5 / Gpu

J

jmcmike

Limp Gawd
Joined
Jul 26, 2002
Messages
506
When applying AS5 to a 9800 core, should you follow the "half a grain of rice" method for P4's or should you spread an even layer on the GPU heat spreader.

I guess, more to the point, is the GPU actually a smaller chip under the center of the heat spreader (like a P4) or is the GPU really that big?
 
The purpose of thermal compound is to help transfer heat at the microscopic level. If you had a 1/8 void it would help but not as much as metal to metal contact. Thin is better....add enough to cover the entire surface. but thin almost where you can just see through.
 
Originally posted by OPUS1
Thin is better....add enough to cover the entire surface. but thin almost where you can just see through.
Click to expand...
I get that concept well enough, but my question really stems out of what the Artic Silver say about AS5. Their position on the P4 for instance is that you will get better results with AS5 that is naturally distributed by the heatsink on the center of the heat spreader. So my question is really whether the core of the 9800 Pro is a small thing in the center of the heat spreader or whether it is rather large, taking up a significant portion of the area under the heat spreader.
 
Not sure about the 9800 but I would guess it's smaller
and the heat spreader is not 100% flat so the rice deal would help to ensure good coverage. I'd say it's a judgement call
I would look at the gpu if it isn't real flat (mine wasn't) lay up allittle more at the depression (NOT ALOT). Take a credit card and schmeer the whole deck that should even things out. This way the most amount of surface area will transfer to the HS. Take the HS and schmeer it on and wipe it off, don't use any remover liquid stuff.
I compared ArcticSilver 3 to Ceramique on my gpu and found them to be the same, temp wise. Using a zalman HP(much better than stock solution)
I went with the Ceramique because it isn't conductive
I get:

36c GPU/27c ambient at idle
52c GPU/31c ambient ovclk

24c room temp

If I had some real cahonies I'd pop the spreader off and contact directly to my HS:D

How bout you, YOU FEELIN LUCKY:eek:
 
I'm reviving this thread in hopes of getting a more definitive answer.

Does anyone know how small the GPU on a 9800 Pro is in relation to the heat spreader?
 
there is no heat spreader on a 9800 pro. it's bare silicon, unless ATi has changed things very very recently. You should be covering that whole thing, the P4 die is most likely smaller than the 9.8kp die, considering the P4 is built on a smaller process, and pics with the heatspreader removed show it to be rather small
 
Really? Wow. That's no chip, it's a space station.

I guess I need to take off the block and reapply the AS5. Thanks for the info.
 
It's on a .15 process, so it's probably a little bigger than it could be ;P

It's only like... 1.3 cm x 1.3cm... unless my estimate is TOTALLY off.. o_O
 
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