Crucial Technology CT12872AB667S 1 GB 240-pin DIMM&nbsp;&nbsp;DDR2 PC2-5300 CL=5 Registered ECC Single Ranked DDR2-667 1.8V 128Meg x 72 Memory 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