Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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What compound do I use on the Ati Radeon graphics card?

I bought a new Ati Radeon HD 2400 XT graphics card for my iMac but it came without the heatsink.

I took my old one apart and realized that they used two different kinds of compounds. The grey silver one on the Ati graphic chip itself and a white chewy one on the four black squares on the board. I assume the black squares are the memory chips.

If I put it together I can use the Artic Silver on the Ati chip but what kind am I supposed to use on the black squares?

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You can still use Arctic Silver on the black memory chips, just make sure that you clean all of the old thermal paste off of the chip before re-applying it.

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Thank you Chris! I used Isopropyl alcohol to clean the white chewy paste off. I also had to use a spudger to scrape it off. Hopefully I did not destroy anything (some of the alcohol dripped on the board).

Do you know why Apple uses two different kinds of thermal paste? Just curious to know.

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The thermal paste that Apple uses varies, it depends on where/when the computer was made, and whatever the factory happened to have in stock when the computer was made.

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