4 gb modules of ddr3 1600 (pc3 12800).

Laptop Notebook Memory RAM DDR3 4GB 8GB 1600MHZ PC3 12800 1.35V

Samsung 4GB Laptop Memory Expansion DDR3-1600 / PC3-12800 204-pin DDR3-SDRAM S.O.DIMM 1.5V

princeton 4GB 240PIN DIMM PC3-12800 DDR3-1600

Samsung Genuine 8GB Laptop Memory DDR3L Compatible Model with Both Voltage PC3-12800 (DDR3-1600) SO-DIMM (compatible 1.35V & 1.5V)

Adtech Unbuffered DIMM 8GB X 2 Disk Set DDR3-1600/PC3-12800 ADS12800D-8GW

Transcend Server Workstation Memory DDR3 1600 8GB 240pin ECC DIMM TS1GLK72V6H PC3-12800 1.5V

Silicon Power Desktop PC Memory DDR3 1600 8GB X 2 240Pin CL11 Mac Compatible SP016GBLTU160N22 PC3-12800 (16GB) 1.5V

Samsung Genuine 4GB Laptop Memory DDR3L Compatible Model with Both Voltage PC3-12800(DDR3-1600) SO-DIMM (Compatible 1.35V & 1.5V)

ADTEC Server Unbuffered 8GB X DDR3-1600/PC3-12800 DIMM, 2, ECC, ADS12800D-E8GW

Transcend Desktop PC Memory DDR3 1600 8GB Compatible 240pin TS1GKR72V6H PC3-12800 1.5V REG-DIMM

Elecom Memory for Laptop PC DDR3-1600 PC3-12800 8G

Kingston Desktop PC Memory DDR3 1600 8GB CL11 DIMM 240pin (PC3-12800) 1.5V Non-ECC KVR16N11/8

ELECOM Laptop Memory Expansion 8GB DDR3-1600 PC3-12800 EV1600-N8G/RO

ELECOM Desktop Expansion Memory 4GB [2012 Model] DDR3-1600 PC3-12800 EV1600-4G/RO

CFD Sales CFD Sales Desktop PC Memory 8GB X 2 Compatibility Guaranteed Lifetime Warranty 240pin Panram DDR3-1600 (PC3-12800) (16GB) W3U1600PS-8G