Crucial Technology CT2CP12872AV667 2 GB (1 GBx2) 240-pin DIMM DDR2 PC2-5300 CL=5 Registered ECC DDR2-667 1.8V 128Meg x 72 Low Profile Memory Kit 240-pin DIMM DDR2-667 DDR2 PC2-5300 Registered, ECC, DDR2-667, 1.8V, 128Meg x 72 The only brand of memory upgrade available directly from a DRAM manufacturer, tested to meet the most stringent industry specifications Install it yourself in about 15 minutes. The same top-quality memory that the worlds largest computer manufacturers install in the systems they sell