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:
Axiom 4gb Low Power Ddr2-667 Ecc Rdimm K 483401-B21-AX Tech-America
HP 8GB PC2-5300 667MHz DDR2 SDRAM Fully-Buffered Memory Upgrade