HYNIX HYMP151F72CP4N3-Y5 4GB SERVER DIMM DDR2 PC5300(667) FULL-BUF ECC 1.8v 2RX4 240P 512MX72 256mX4 Hynix DDR2 Server RAM Memory Model: HYMP151F72CP4N3-Y5 Capacity: 4GB Data Transfer Rate: 667Mhz Pins: 240