Product Detail Model # OCZ2RPR10664GK Timing: 5-5-5-18 Voltage: 2.2V Patent-pending Reaper HPC Heatsink . The "OCZ OCZ2RPR10664GK PC2-8500 DDR2 Dual Channel Reaper Series 1066MHz 4G Kit CL 5-5-5-18 Memory" is best product for you. We recommended OCZ OCZ2RPR10664GK PC2-8500 DDR2 Dual Channel Reaper Series 1066MHz 4G Kit CL 5-5-5-18 Memory