Transcend Information 4 GB DDR3 1333 SO-DIMM - Frustration-Free Packaging (JM1333KSN-4GE) 204-Pin DDR3 1333MHz SODIMM 4096MB With 256Mx8; CL9 JEDEC standard 1.5V  0.075V Power supply Programmable/CAS Write Latency (CWL) = 7 Limited Lifetime Warranty RoHS compliant products. Clock Freq: 667MHZ for 1333Mb/s/Pin