Kingston Value (KVR16N11S8/4) RAM 4GB 1600MHz PC3-12800 DDR3 Non-ECC CL11 DIMM SR x8 Desktop Memory at Amazon.com
4GB Large Capacity DDR2 Memory Module for Desktop Computer, 240PIN 800MHz Fast Data Transmission RAM DDR2 4GB PC2-6400 Bandwidth, Plug and Play at Amazon.com