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GPU Insulating - Page 2

post #11 of 14
Thread Starter 
Quote:
Originally Posted by tuffarts View Post

VRM's just air?

I am going to see what type of heat I am dealing with first, if they get rediculosly hot I will have to address them with some heatsinks.

For now will just be blowing 150CFM at them ............ thumb.gif
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Leviathan
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post #12 of 14
lmao
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post #13 of 14
im still rockin the vaseline on the back side here.....100% fool proof, works every time, and fast too.
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post #14 of 14
those VRMs will get kind of hot, they are 5 phases for GPU core, but the issue is yes they are DirectFETs, but top notch DirectFETs are only rated 40A-50A continuous, so your pushing them close to max continuous. On the upside the DirectFETs has excellent thermal properties as they are CopperMOS as well, and the current beware of this, flows through the copper of the MOSFET, so watch out you don't short out the FETs, I have a picture of how DirectFETs work:

105

Above is how DirectFETs work, but not how normal powerstages work in many ways. First of all current doesn't flow through the exposed body of most MOSFETs, and secondly current doesn't flow through one FET to the other, in normal powerstages the MOSFEts are connected, and at the connection they are both equally connected to the inductor where the current flows in.

Honestly is there anyway you cut off the heatsink provided? just don't pure bare metal on those MOSFETs without a thermal tape.

Either way the FETs will be cooled through the PCB, but id find a way to leave the orignial metal heatsink on there and insulate around it.
Edited by Sin0822 - 2/4/12 at 12:53pm
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