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Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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Cooling Paste on Graphics Chips?

Hi!

So, over the course of the few times that I’ve had to disassemble my iMacs for repairs, I’ve noticed a white paste on my iMac’s GPU chips in both my Mid ‘07 24” iMac w/ C2D X7900 & Radeon 2600 Pro as well as my Late ‘06 24” iMac w/ C2D T7600 & GeForce 7600GT.

I was curious as to what this is? It is on the Black GPU chips on both cards and it’s not a pad, rather a paste or putty of sorts. I can’t figure out what it is, my first guess was that it was a thermal pad of sorts, but the fact that it moves around so much like playdoh, tells me it’s not a thermal pad.

Attached are images of both my ‘07 and ‘06 GPUs chips covered in it. It’s obvious it’s not thermal paste, or at least traditional thermal paste.

From what I’ve heard, if you put typical thermal paste on them, they’ll overheat. If anyone could tell me what this is and where to find the highest quality replacement, it’d be greatly appreciated.

Thanks, Ashton.

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The white paste is a called a gaping thermal paste. It is not as good as thermal pads in the ability to transfer heat to the heat sink. To save time during manufacturing Apple uses this goo.

A CPU or GPU thermal paste is designed to be compressed as it’s designed to fill the microscopic imperfections within the heat sink and the chip its self (or metal can covering the CPU chip).

If you try using a CPU/CPU thermal paste it just won’t carry the heat across effectively and you will damage your VRAM chips.

What I do is dry fit the heatsink onto GPU and then I use a feeler gage to measure the distance between the VRAM chip and the heat sink so I properly size the needed thermal pad (you can also just use some strips of card stock instead of a feeler gage). You want a snug fit not loose! Here’s the material I use.

I’ve also been playing with this material as its a bit better but a bit more expensive: 3M 5519 Thermal Interface Pad

Clean the surfaces fully and cut the pad material just a hair larger than the VRAM chip as over time it will shrink. As far as the GPU chip make sure you don’t exceed the chips surface as some thermal pastes are conductive enough to interfere with the signals Don’t use liquid metal! Frankly I find either Thermal Grizzly's Kryonaut thermal paste or ArcticSilver5 paste is just fine. I mostly use Kryonaut these days as its a bit better.

Here’s a bit more on how one measures thermal conductivity Understanding Thermal Conductivity And Thermal Resistance

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Thanks so much, I was really having a hard time finding out what it was. Really appreciate it.

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