4GB 2 X 2GB DDR2 Memory for iMac 7,1 Mid 2007 20" inch 24" inch Intel Core 2 Duo 2.4GHz PC2-5300 667MHz 200 pin SODIMM (PARTS-QUICK) Halogen Free, ROHS Speed: PC2-5300 667MHz SODIMM Form Factor: 200 pin SODIMM Capacity: 4GB 2 x 2GB Kit Warranty: Lifetime