Corsair 4GB DDR3 SDRAM Memory Module - For Notebook, Desktop PC - 4 GB (1 x 4GB) - DDR3-1066/PC3-8500 DDR3 SDRAM - 1066 MHz - Non-ECC - Unbuffered - 204-pin - SoDIMM - Lifetime Warranty SODIMM MAC MEM FOR IMAC MACBOOK PRO - CMSA4GX3M1A1066C7

Corsair 4GB DDR3 SDRAM Memory Module - For Notebook, Desktop PC - 4 GB (1 x 4GB) - DDR3-1066/PC3-8500 DDR3 SDRAM - 1066 MHz - Non-ECC - Unbuffered - 204-pin - SoDIMM - Lifetime Warranty SODIMM MAC MEM FOR IMAC MACBOOK PRO

Corsair Memory is specifically designed for rock-solid stability in demanding applications. Data lines are carefully engineered for noise immunity; clock lines are optimized for minimum skew. All modules use JEDEC-compliant six-layer.