Full Details from Amazon.com : http://www.amazon.com/gp/product/B008O52YJI?tag=onigi-20
4GB RAM Memory Upgrade for Sony VAIO CW Series VPCCW21FX (DDR3-1066MHz 204-pin SODIMM)
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
204 pin module
RAM Memory will speed up your computer
