Fully compatible with Mac, the Crucial 2GB DDR3 1066MHz Unbuffered RAM takes the guesswork out of a memory upgrade with complete installation support. RAM Features Type: 204-Pin DDR3 SDRAM Form Factor: SO-DIMM Capacity: 2 GB Speed: DDR3 1066 Voltage: 1.5V Dimensions: 66mm x 30mm Compatibility: Mac