Crucial 1GB kit (512MBx2) Upgrade for a Dell Dimension 4600 System (DDR PC3200, NON-ECC, CL=3) 184-pin DIMM DDR400 DDR PC3200, CL=3, Unbuffered, NON-ECC, DDR400, 2.6V, 64Meg x 64 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