Full Details on Amazon.com : http://www.amazon.com/gp/product/B00AQ2BP1K?tag=tsukuyomi-204GB (2x2GB) Memory RAM for Apple iMac 20-inch 2.4GHz Intel Core 2 Duo (MA877LL) sodimm200PIN SO-DIMM PC2-5300 DDR2-667 667MHZ 2PCS KIT