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Thermal Paste on CPU
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Fresh-Faced Recruit
Join Date: Aug 2006
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I recently acquired a Dual G4 1.25ghz MDD, the person that had the machine prior had removed the heatsink from the CPU board, so the thermal paste bond between the chips and the heatsink was broken - it obviously goes back onto the heatsink with no problems, but I am wondering if it is a good idea to remove the old thermal paste and redo it - is this a big issue, or nothing to worry about? Thanks!
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Moderator  Join Date: May 2001
Location: Hilbert space
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If the thermal paste is smeared and there are fingerprints and such on the cpu, it's safer to remove the thermal paste and even work with no thermal paste at all, provided that the heatsink and the cpu are cleaned properly. If you happen to have thermal paste (e. g. Arctic Silver) lying around or you want to buy some, then apply only a thin layer with a ruler. Thermal paste does not conduct heat very well! (The reason why it is necessary to use thermal paste is that it bridges the tiny gap of air between the cpu and the heatsink as it conducts heat better than air.)
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I don't suffer from insanity, I enjoy every minute of it.
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Fresh-Faced Recruit
Join Date: Aug 2006
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Thank you! I probably will just leave it alone then, there are no fingerprints and its not smeared, it's just seperated...like a few pieces are on the heatsink, and a few on the processors - so when you put the heatsink back on they match up. - RJGill
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Moderator Join Date: May 2001
Location: Hilbert space
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No, they don't really match up. I would remove the thermal paste and reapply it.
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I don't suffer from insanity, I enjoy every minute of it.
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Moderator  Join Date: Sep 2001
Location: Arizona
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Seconded.
Just scrape off what you can and clear the rest of the residue with a few rubbing alcohol wetted cotton balls to get the surfaces as clean and smooth as possible. Then drop $5-10 for a tube of Arctic Silver 5 thermal paste. It's easier to apply than the pads and does a much better job anyways.
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Mac Elite
Join Date: Oct 2004
Location: Downtown Austin, TX
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Thirded. A good appliance of thermal paste can drop temps considerably.
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Fresh-Faced Recruit
Join Date: Aug 2006
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Thanks for the advice guys...I just scraped it off and reapplied - I feel more comfortable knowing things are done properly now. - RJGill
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Moderator Join Date: Sep 2001
Location: Arizona
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I just applied Arctic Silver 5 to my MDD's CPUs. After removing the remains of the original thermal pads, I used ultra fine sand paper on the copper base of the heatsink to smooth it out. Then I polished it with some of the Arctic Silver, to fill in any abrasions in the copper. Then did one little dab of Arctic Silver per processor die and perfecto.
I've noticed that my CPU fan doesn't rev up as much as it did. Definitely worth the time/effort.
(Last edited by Lateralus; Aug 10, 2006 at 10:28 PM.
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I like chicken
I like liver
Meow Mix, Meow Mix
Please de-liv-er
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