Mailinglist Archive: opensuse (2459 mails)

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Re: [opensuse] How much difference does the right amount of thermal grease make? -- A LOT!
  • From: Basil Chupin <blchupin@xxxxxxxxxx>
  • Date: Tue, 25 Mar 2008 11:05:39 +1100
  • Message-id: <47E841D3.6000500@xxxxxxxxxx>
David C. Rankin wrote:

I thought I would pass on the results of a (non-official) scientific test concerning the huge difference in cpu temperature just a small difference in the amount of thermal grease can make. The results below are on an AMD thoroughbred 2400+ using Manhattan silver grease.

Test #1 (dab of grease on processor core with syringe, pencil eraser size, roughly 3mm high -- result - way too much)

temp2: +62.5°C (high = +120°C, hyst = +115°C) sensor = transistor

Test #2 (minimal amount of grease brushed on with Q-tip, very thin layer, much less than 1mm thick)

temp2: +51.0°C (high = +120°C, hyst = +115°C) sensor = transistor

Word to the wise, DON'T USE TOO MUCH GREASE!
Even the <1mm is too much!

And don't use Q-tips! They will leave a fibre behind and all your hardwork will
be wasted.

To do a proper job, clean the contact surfaces (cpu and heatsink) with acetone (get a small bottle from the pharmacy) - but NOT the stuff women use to remove nail polish (it contains oil)! Don't touch the surfaces once this is done, and protect the surfaces from contamination from dust etc.
Place a SMALL tab - about the size of matchhead on the little small engraved
area on the cpu.

Use your CREDIT CARD (make sure the edges are clean) and use it to spread (as)
EVENLY (as possible) the silver grease across the surface of the cpu contact

Put the cpu into its socket, making sure to keep dust etc off the cpu and then
put the heatsink in place. After the heatsink is in place and clipped in,
gently move the heatsink clockwise and anticlockwise to help spread the grease
to better match the mated surfaces.

Job is now done but also remember that it takes some hours/days of running the
computer for the silver grease to become really effective - read the
instructions which come with the grease.


If you really want to know, you won't ask me.

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