64GB Kit (8x8GB) Fully Buffered DDR2 Server Ram/Memory. PC2-5300 667MHz DDR2 DIMM ECC (Fully Buffered) 240 Pin 1.8V at Amazon.com
8GB Kit 2 X 4GB DDR2 Server Memory Upgrade for IBM System x3550 1913, 7978-xxx SDRAM ECC Fully Buffered FB DIMM PC2-5300 240 pin 667MHz RAM (PARTS-QUICK Brand) at Amazon.com
64GB (8 x 8GB) DDR2-667 MHz PC2-5300P ECC Registered Server Memory Upgrade Kit | Cloud Ninjas | Reviews on Judge.me
Servers - Fully Buffered: 512MB 667Mhz PC2-5300F DDR2 240-Pin FBDIMM Fully Buffered ECC Server Memory Module - CPU Medics
Micron 6GB Kit 6x1GB 1Rx4 PC2-3200R-333-12-C0 DDR2 Server Ram MT18HTF1