4GB PC3-8500 1066MHz DDR3 SO-DIMM

This Grade "A" memory module is guaranteed to be 100% compatible with your Apple computer and comes with a Lifetime Warranty.

Compatible with the following Models:

27" 2.66GHz Quad-Core Intel Core i5 and the 2.8GHz Quad-Core Intel Core i7 Penryn Aluminum iMacs introduced October 2009
• 0MB onboard
• 16GB Maximum
• 4 slots

21.5" 3.06GHz Penryn Aluminum iMacs introduced October 2009
• 0MB onboard
• 8GB Maximum
• 2 slots

2.66GHz, 2.93GHz, and 3.06GHz Penryn Aluminum iMacs introduced March 2009
• Machine ID: iMac9,1
• 0MB onboard
• 8GB Maximum
• Install in singles, but can use interleaving when installed in pairs.
• 2 slots

2.26GHz Penryn MacBook introduced October 2009
• Machine ID: MacBook6,1
• 0MB onboard
• 8GB Maximum
• Install in singles, but can use interleaving when installed in pairs.
• 2 slots