Hacking Do you repaste thermal compound each time reinstall heatsink?

ps786 · Oct 23, 2020

Do I need to remove CPU heat shield and reapply thermal paste between CPU and copper foil when remounting heat sink? I understand you need to repaste the layer between copper foil and heat sink, but what about the layer underneath? The reason I am asking is when I am removing heatsink, I noticed the copper foil was lift up a few millimeters by the adhesion. Would this cause the paste underneath to shift?

Thanks!

DinohScene · Oct 23, 2020

I repaste every CPU/GPU heatsink of every bit of electronics equipment that has a CPU/GPU with heatsinks/active cooling that can be assembled and disassembled.

I'm actually shocked that there's people who don't do it.

Deleted User · Oct 23, 2020

yes, irrelevant of what device uses thermal paste.
having an air bubble in between the die and the heatsink is an unacceptable mistake, even if it's wasteful to constantly reapply paste

MaxiBus · Oct 24, 2020

He speaks about the gap between CPU and heat(?)shield. If he doesnt take it off, theres no need to reapply the stuff in my opinion.

ps786 · Oct 25, 2020

MaxiBus said:
He speaks about the gap between CPU and heat(?)shield. If he doesnt take it off, theres no need to reapply the stuff in my opinion.

Yes, I did it anyways but it turns out totally unnecessary. The slight upward movement when removing heatsink didn't affect thermal paste between heat shield and cpu.

izy · Oct 26, 2020

I just remove the copper sticker and paste directly from heatsink to cpu because honestly the sticker does nothing and usually the thermal paste applied underneath is trashly done

ps786 · Oct 26, 2020

squee666 said:
I just remove the copper sticker and paste directly from heatsink to cpu because honestly the sticker does nothing and usually the thermal paste applied underneath is trashly done

When you turn the CPU shield over, there is a white strip surrounding copper foil. Did it came off when you remove the copper foil? I could be wrong but I think that strip is to insulate CPU caps from heatsink.

susi91 · Oct 26, 2020

ps786 said:
When you turn the CPU shield over, there is a white strip surrounding copper foil. Did it came off when you remove the copper foil? I could be wrong but I think that strip is to insulate CPU caps from heatsink.

Could be wrong too, but afaik thats a 'glue' coating or something like that..
glues/connects the copperfoil and the shield together, i.e. electromagnetic shielding

ps786 said:
Do I need to remove CPU heat shield and reapply thermal paste between CPU and copper foil when remounting heat sink? I understand you need to repaste the layer between copper foil and heat sink, but what about the layer underneath? The reason I am asking is when I am removing heatsink, I noticed the copper foil was lift up a few millimeters by the adhesion. Would this cause the paste underneath to shift?

Thanks!

If you remove the foil, its hard to get the thing back in place. Ofc both sides of the foil needs thermal paste...

britain4 · Oct 26, 2020

ps786 said:
When you turn the CPU shield over, there is a white strip surrounding copper foil. Did it came off when you remove the copper foil? I could be wrong but I think that strip is to insulate CPU caps from heatsink.

I’ve removed the copper foil on mine, it didn’t take the white insulation off.

Removed the copper foil and used MX4 when reassembling after the chip install and I haven’t really noticed a difference in cooling/fan speed either way.

Hacking Do you repaste thermal compound each time reinstall heatsink?

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