Axiom 8GB DDR3-1066 ECC RDIMM for HP500664-B218GB (1 x 8GB)1066MHz DDR3-1066/PC3-8500ECCDDR3 SDRAM 500664-B21-AX - Corporate Armor
G.SKILL 8GB (4 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory Model F2-8500CL5D-4GBPK for Sale in Cutler Bay, FL - OfferUp
Low Latency DDR2 800MHz versus 1,066MHz | bit-tech.net