On the iPhone logic board (or at least for the iPhone 6), there is a metal shield (heatsink?) covering the A8 SoC and few other components. There is also black thermal paste between the chip and shield. I have the grey thermal paste for computer processors and heatsinks, but I don't have, nor have I seen, the black paste being sold. Can I use the grey thermal paste with the A8, without it overheating and with it working long term?
IPhone – Thermal paste for A8 chip
hardwareiphonelogicboardprocessor
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Best Answer
The article Thermal Paste Thermal Tape Question Logic Board mentions a similar black substance used in a G4 PowerBook logic board:
Unfortunately, as you mention, there appears to be no source for the black thermal substance1. However, silver (which has an extra 5% efficiency) thermal paste, rather than white , should do the trick.
1 Unless this Thermal paste for iPhone 5 Mainboard is the black stuff.