4GB 2 X 2GB PC2-5300F 667MHz 240 pin DDR2 SDRAM ECC Fully Buffered FB DIMM Server Low Power Memory for HP Workstation XW8600 (PARTS-QUICK BRAND). Equivalent to HP Part Numbers: 397413-B21, 442823-B21,
8GB (2x 4GB) PC2-5300F FULLY BUFFERED SERVER RAM FOR DELL POWEREDGE R900 | eBay
Komputerbay 8GB (4x 2GB) DDR2 PC2-5300F 667MHz CL5 ECC Fully Buffered 2Rx4 FB-DIMM (240 PIN) w/Heatspreaders (This is used mainly in Servers - will not work with NON ECC UnBuffered) at Amazon.com