Patriot 1.35V DDR3 4GB PC3-10600 1333MHz CL11 SODIMM Memory PSD34G1333L81S PC3-10600 (1333MHz) Data Rate 1.35V Power Requirement Ultrabook Compatible 7.8US Refresh Interval (8192 CY CLES/64MS) Auto and self r efreshPCB height: 1181(mil) capability PCB height: 1181(mil) Serial Presence-Detect (SPD) 100% Tested