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7970 vrm heatsinks of back of pcb

post #1 of 50
Thread Starter 
Anyone try to put little heatsinks on the backside of the pcb for the VRM? Looks like we could gain a few C by placing heatsinks and thermal tape there.

But there's lots of resisters there. I'm not sure if it would short circuit. Anyone try it, or want to try it?


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post #2 of 50
Use thick thermal tape and there should not be a problem. I doubt you see much of an improvement in temps though.
    
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post #3 of 50
I asked this same question in the Vapor-X thread. SoNda5 said he would not recommend doing it, otherwise there was no input.

I cant see why it wouldn't offer substantial improvements in temps, just worried it might cause electrical issues..

Considering putting a 92mm Intel Stock Heatsink fan on the back of the PCB reduced temps for VRM1 AND 2 by nearly 10c each, a heatsink should be upwards of 20-30?
post #4 of 50
The chips on the underside are most likely responsible for the temperature readouts, while the mosfets are on the other side. It could be that you cooled down the thermal diodes, but the VRMs still run hot. This could be dangerous as the card will not throttle when it should.

By the way I only just tightened the screws for the VRM heatsinks - temps down 6C for VRM1 and 3C for VRM2.
post #5 of 50
If you really feel strongly about it, mod an ek backplate onto the card.
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post #6 of 50
@glina: Hm, good point. I never realized those black chips werent the VRMs themselves.

@tsm106: Is there a guide for this?
post #7 of 50
I put some EK backplates on my 7970`s . they do run slighty cooler, thermal tape pushing down on the VRMs also.



post #8 of 50
Thread Starter 
Quote:
Originally Posted by NathG79 View Post

I put some EK backplates on my 7970`s . they do run slighty cooler, thermal tape pushing down on the VRMs also.


how thick are the backside thermal tape?
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post #9 of 50
Those are phase driver ICs (the ones on the left side of the image anyway), and they can produce substantial heat. Cooling them can certainly help, but their small size makes it difficult. You'd also need good air flow over the back of the card for it to matter much.
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post #10 of 50
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someone's gotta be brave and put heatsinks on there with normal thermal tape... not the thick thermal pad stuff.

just touching those chips is enough to freeze my computer.
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