OWC 6.0GB (2GB + 4GB) PC-8500 DDR3 1066MHz Kit for MacBook/MacBook Pro Unibody; iMac 2009 Models.

6.0GB OWC Memory Upgrade Kit
2.0GB + 4.0GB PC8500 DDR3 1066MHz 204 Pin

Product Specs:
Technology: DDR3 SDRAM
Density: 2GB (2048MB) + 4GB (4096MB)
RoHS: Yes
Pin Count: 204-pin
Op. Temp.: 0C to +85C
Data Rate: DDR3-1066
Speed: PC3-8500
CL: CL = 7
Cycle Time: 1.875ns
Voltage: 1.5V
ECC: Non ECC
Module Ranks: Dual Rank
Register: Non Parity
Low Noise 8-Layer PCB
Meets and/or Exceeds Apple/Intel Specifications
Fully compliant with JEDEC specifications