2GB Kit (2x1GB) Memory RAM Upgrade for Dell Optiplex GX520 Tower (DDR2-400MHz 240-pin DIMM) When you purchase RAM from 4AllDeals, it comes with a lifetime warranty, as well as lifetime telephone technical support from our US-based technicians. PLEASE NOTE If you do not purchase this module from 4AllDeals direct, you do not get the lifetime warranty or tech support offered in this ad. 240 pin module RAM Memory will speed up your computer!