Transcend JetRam 4 GB 240-Pin DDR3 Desktop DIMM 1333 MHz (PC3-10600) Desktop Memory Module JM1333KLN-4G 240PIN DDR3 1333 MHz Unbuffered DIMM 4GB with 256Mx8; CL9 JEDEC standard 1.5V  0.075V Power supply Clock Freq: 667MHZ for 1333Mb/s/Pin Programmable /CAS Write Latency (CWL) = 7 Serial presence detect with EEPROM 240PIN DDR3 1333 MHz Unbuffered DIMM 4GB with 256Mx8; CL9 JEDEC standard 1.5V  0.075V Power supply Clock Freq: 667MHZ for 1333Mb/s/Pin Programmable /CAS Write Latency (CWL) = 7 Serial presence detect with EEPROM RoHS compliant products. Bi-directional Differential Data-Strobe Limited Lifetime Warranty