Crucial Technology BL25664BN1608 2 GB Ballistix 240-pin DIMM DDR3 PC3-12800 8-8-8-24 Unbuffered NON-ECC DDR3-1600 1.65V 256Meg x 64 Memory Module Size - 2GB Package - Ballistix 240-pin DIMM Feature - DDR3 PC3-12800 Specs - DDR3 PC3-12800 / 8-8-8-24 / Unbuffered / NON-ECC / DDR3-1600 / 1.65V / 256Meg x 64