Designed for current generation notebooks and mini-PCs, Crucial’s new high density module allow users to maximize memory bandwidth and minimize performance bottleneck to deliver superior user experience. You won't find a better-performing memory upgrade — with superior service and support — at a greater value. You can trust us. Our company is part of Micron, the largest DRAM manufacturer in the U.S. and one of the largest in the world, which gives us unparalleled expertise in the upgrade industry. -800 MHz DDR2- CL 6- Unbuffered- 1.8 Volts- Lifetime Warranty- 240 Pin DIMM- Apple IMac Compatible (Please check http://support.apple.com/kb/HT1423)