4GB 2 X 2GB PC2-5300F 667MHz 240 pin DDR2 SDRAM ECC Fully Buffered FB DIMM Server Memory for IBM System x3650 1914, 7979-xxx (PARTS-QUICK Brand) at Amazon.com
4GB 2Rx4 PC2-5300F-555-11 by HP at Amazon.com
Samsung 8GB PC2-5300f DDR2 ECC Memory M395T1K66AZ4-CE66 at Amazon.com
9965378-093 - 4GB 2RX4 PC2-5300F DDR2-667 - Inside Systems A/S