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Post originale di: Josh ,


I'm 90% certain that the heatsinks are not the same size.  I don't have one in front of me at the moment, though.

Since you already bought the processor, just try to install it with the 20-inch heatsink.  The only potential drawback would be firmware incompatibilities.  iMacs aren't meant to be upgraded... so I don't know if your 20-inch logic board will be able to use the new processor properly.