Product Detail 533MHz fCK for 1066Mb/sec/pin Programmable CAS Latency - 5,6,7,8,9,10 Posted CAS Programmable Additive Latency - 0, CL - 2, or CL - 1 clock Programmable CAS Write Latency (CWL) = 7(DDR3-1066) . The "Kingston 2GB 1066MHZ DDR3 DIMM PC Memory" is best product for you. We recommended Kingston 2GB 1066MHZ DDR3 DIMM PC Memory