Hynix 4GB PC3-12800 DDR3- 1600MHz non-ECC Unbuffered CL11 240-Pin DIMM HMT351U6CFR8C-PB Technology: CMOS Memory Width: 64 Supply Voltage-Max (Vsup) 1.58 V, Supply Voltage-Min (Vsup) 1.42 V, Supply Voltage-Nom (Vsup) 1.5 V