Replace VRM thermal pads on GPU

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Alanthor

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Mar 17, 2014
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Hi,

Im thinking of replacing the thermal pads on the VRM's. After trying all thermal paste application methods, the thermal pads has gotten abit rough, hehe.. But the question is, are my thermal adhesive pads worse than stock?
I got:
Alphacool double-sided thermal adhesive pads
Technical specifications:
Material: Polymers
Colour: White
Dimensions (L x W x H):100x100x0,5mm
Thermal conductivity: Up to 1W/mk
Adhesive strength: min: 16N/25mm

electrically non-conductive
conforms with ROHS
 
Solution
S
The thermal resistance is stated in oC/W (degrees Celsius per watt) or oK/W (degrees Kelvin per watt). But they wrote it backwards.

Anyway, temperature increase in 0,001 oC (or oK) for every watt of power dissipation is negligible.

It is a good thermal pad.

Edit: OK, they are stating the thermal conductivity (the opposite of thermal resistance). I really don't know why are they doing that...
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Slobodan-888

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Jul 17, 2014
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The thermal resistance is stated in oC/W (degrees Celsius per watt) or oK/W (degrees Kelvin per watt). But they wrote it backwards.

Anyway, temperature increase in 0,001 oC (or oK) for every watt of power dissipation is negligible.

It is a good thermal pad.

Edit: OK, they are stating the thermal conductivity (the opposite of thermal resistance). I really don't know why are they doing that...
 
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Alanthor

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Mar 17, 2014
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I used triple layer of the thermal adhesive... I hope I didnt screw my whole GPU now... What happends if the VRM's overheats alot? I got no sensors on the VRM :( Tho, GPU core temp dropped from 32C to 28C. I did my favorite which i always do on my CPU.

Tint the heatsink, and then apply a small X on the core.
 
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Slobodan-888

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Use multiple layers of thermal pads only if you have to (to get the right thickness so you can mount the heatsink). But if only one is enough, you should use only one. More layers - higher thermal resistance / lower thermal conductivity and higher temperatures.

About VRM. It is not really a module (it would be if it is all integrated in one sealed case). It is a DC/DC buck (step-down) converter. The components in that converter that will heat up are FETs, schottky diodes, and coils. There are no temperature sensors on them, so if they overheat, they can fail.
 
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Alanthor

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Mar 17, 2014
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But my ASUS 280X had sensors on the VRM's.. But this 270X doesnt.. Im thinking of placing a digital probe on it, like baked in the thermal adhesives..
I had to use tripple layers of adhesive to get the same thickness as the original was... Now, the artifacts in games is even worse after 40min of gameplay.... Fuck.. Can I put thermal paste on the VRM, then put thermal adhesive on?
 
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Slobodan-888

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Wrongly called "VRM" does not have temp sensors on its own, but designer can put them, of course. Yes, you can put sensors by yourself (make sure it is in the contact with component).

If you can (physically) use one layer of thermal pads, then do that. You will have better thermal performance.

Thermal pad serves the purpose of thermal paste. Adding thermal paste to the thermal pads will decrease thermal performance (increase component temperature).
 
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Alanthor

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I do know that the actual VRM component doesnt have a temp probe on it when manufactured, but I guess you mean like ASUS, Sapphire etc with "Designers".

Im getting RSOD (Red screen of death) now aswell, related to dxgmms1.sys, and I think thats related to the GPU.. Well... I just fked up my GPU, why do I always gotta go inside and replace things... -.-

I cant use just one layer, or well, i havent tryed, but I thought I had to make sure that the thermal pads is the same thickness as the one I replaced.. Should I try with one layer? Does the PC shutdown if the VRM or mosfets or whatever gets overheated so i dont damage my gpu perm?
 
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Alanthor

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I think I might have been mixing the mosfets and VRMs.. Or actually, I have no clue on what it actualy is... But its 4 black squares, some sort of chips that is on the right side of the GPU. Is that VRM or mosfets or? They are prety big.
 
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Alanthor

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So, was this replacement a total fail? Its 1W/mK, is that good?

Anyways, i wasnt talking about the VRMs, lol.. It's actually the memory on the GPU that I mixed up with VRMs...
 
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Slobodan-888

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Yes I know. But in this case it is the same. 1W/mK = 1mK/W (1 devided by 1 is still 1).



Give me the picture and I will mark them.
 
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