Samsung 4GB (2X 2GB) DDR2 PC2-5300FB-DIMM 240Pin 667MHz Server M395T5750EZ4-CE6 4GB Samsung Kit (2x2GB) DDR2 667mhz PC2-5300F ECC Fully Buffered 2Rx4 Server RAM 4GB Samsung Kit (2x2GB) DDR2 667mhz PC2-5300F ECC Fully Buffered 2Rx4 Server RAM