LEVEN DDR2 4GB (4GBx1) 667MHz PC5300 Unbuffered Non-ECC UDIMM 240 Pin PC Computer Desktop Memory Module Ram Upgrade- (JR2U667172208-4M) at Amazon.com
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Best Buy: CORSAIR Vengeance 16 GB (2PK x 8GB) 1.6 GHz DDR3 DIMM Desktop Memory Kit Multi CMZ16GX3M2A1600C9