Full Details from Amazon.com : http://www.amazon.com/gp/product/B004M17BVO?tag=onigi-20G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop MemoryType 240-Pin DDR2 SDRAM Speed DDR2 1066 PC2 8500