4GB 2 X 2GB PC2-5300F 667MHz 240 pin DDR2 SDRAM ECC Fully Buffered FB DIMM Server Low Power Memory for IBM System x3650 1914, 7979-xxx (PARTS-QUICK BRAND). Equivalent to IBM Part Numbers:
OWC 4.0GB PC5300 DDR2 ECC 667MHz 240-Pin FB-DIMM... at MacSales.com