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8GB [2x4GB] DDR3-1066 (PC3-8500) ECC RAM Memory Upgrade Kit for The Apple Mac Pro Quad-Core 2.66GHz 1TB 2.66GHz 1024GB (Z0G1-2.66-8GB-1TB) (Genuine A-Tech Brand) at Amazon.com
8GB (2 X 4GB) DDR3 1066MHz PC3-8500 240-pin Memory RAM DIMM for Desktop PC by NEMIX RAM at Amazon.com
KOMPUTERBAY 4GB 2X 2GB DDR2 1066MHz PC2-8500 DDR2 1066 (240 PIN) DIMM Desktop Memory with Heatspreaders at Amazon.com
Komputerbay 8GB (2 X 4GB) DDR2 DIMM (240 pin) 800MHZ PC2-6400 PC2-6300 Desktop RAM with Red Heatspreaderss for Extra Cooling CL 5-5-5-12 at Amazon .com
IBM 8GB 1X8GB 4RX8 PC3-8500-CL7ECC DDR3 1066VLP RDIMM 8 DDR2 1066 PC2 8500 Internal Memory 46C7499 at Amazon.com