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
DDR3 RAM】 Gigastone Desktop RAM 8GB (2x4GB) DDR3 8GB DDR3-1600MHz PC3-12800 CL11 1.5V 240 Pin Unbuffered Non ECC UDIMM for PC Computer Desktop Memory Module (Desktop ONLY) at Amazon.com