Patriot Memory Signature Line DDR3 4GB (1x4GB) UDIMM Frequency PC3-12800 (1600MHz) 1.5 Volt - PSD34G16002 240-Pin Dual in-line memory module Frequency PC3-12800 (1600MHz) dual Data Rate, Cas 11 Capacity: 4GB (1x4GB) Voltage: 1.5V 100% Tested, RoHS Compliant, Limited lifetime warranty