Full Details from Amazon.com : http://www.amazon.com/gp/product/B0009JR84I?tag=onigi-20
Kingston ValueRAM 1 GB Kit (2x512MB Modules) 667MHz PC2-5300 DDR2 DIMM Desktop Memory (KVR667D2N5K2/1G)
1 GB kit including two 512 MB modules of 667MHz DDR2 Desktop Memory
Specifically designed and tested for compatibility in various makes and models of desktop computers
240-pin unbuffered DIMM
From the industry leader in PC memory
Backed by a lifetime warranty and free technical support