Apple kits compatible with all Mac Pro computers (quad-core and 8-core)
Part Number and description
MA985, 1GB 667MHz DDR2 FB DIMM ECC - 2x512MB
MA986, 2GB 667MHz DDR2 FB DIMM ECC - 2x1GB
MA987, 4GB 667MHz DDR2 FB DIMM ECC - 2x2GB
MA988, 500GB Serial ATA 3Gb/s Hard Drive for Mac pro
MA989, 750GB Serial ATA 3Gb/s Hard Drive for Mac pro
Apple kits compatible only with quad-core Mac Pro computers
Part Number and description
MA684, 1GB 667MHz DDR2 FB DIMM ECC - 2x512MB
MA685, 2GB 667MHz DDR2 FB DIMM ECC - 2x1GB
MA833, 4GB 667MHz DDR2 FB DIMM ECC - 2x2GB
MA690, 500GB Serial ATA 3Gb/s Hard Drive for Mac pro
MA851, 750GB Serial ATA 3Gb/s Hard Drive for Mac pro
It really looks weird and unexpected as specifications for both memory and hard drive options are identical for the 4 and 8 Cores Mac Pro models. The only explanation we can find is linked to the requirement to better manage the temperature inside the case, so in the 8 Cores Mac Pro, Apple might have improved both the cooling system of the RAM modules and the heat released by the HD.
We really hope that those different part numbers are there only to preserve the relative silent working status of the new Mac Pro, and that Apple is not back to the dark age with exotic specifications for each standard components found in hardware models.
