Axiom 4GB Low Power DDR2-667 ECC RDIMM Kit (2 x 2GB) for HP # 483401-B – The Collective Supplies
4GB G.Skill DDR2 PC2-8800 1100MHz TT (PI) Series (5-5-5-15) Dual Channel kit w/ PI Heatsinks
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OCZ Flex EX 4GB (2 x 2GB) DDR2 1200 (PC2 9600) Desktop Memory Model OCZ2FXE12004GK - Newegg.com