Product Detail 533MHz 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 "1GB 1066MHZ Dimm DDR3" is best product for you. We recommended 1GB 1066MHZ Dimm DDR3