As long as it's the same for each block you mount it should'nt affect it. Nice temps on the AMD block BTW
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The temp differential does get bigger as more heat is introduced, so you would expect to see less of a 'gap' between a P4 and a hotter AMD. AFAIK that is
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I'd like to see the difference (C/W) in them in a BillA style test, I think you'd see a bigger gap when it's not 'system restricted' so to speak...
Have you got any pics up of your latest block finished lee?..