Good evening folks, I am going to upgrade my laptop's memory to 8gb (max that it says it supports 2x4gb). Now the manual that came with my laptop says it supports DDR3 at 1066MHz and 1333MHz but in parenthesis says it operates at 800MHz. Now my question is: is it better to get 1333MHz (which generally clocks in with a higher CAS) or get 800MHz for the (generally) lower CAS? Any help would be great. Thanks.