I have an HP Pavilion 500-164 and I'm looking to upgrade the RAM. The problem is that I've heard I can only install DDR3 1600 or 1866 and the CAS latency has to be 11, but the HP website just says 1600 or 1866 without mentioning the latency. My PC currently has the RAM it came with which is a single 8GB stick running at 1600 with a latency of 11, but I'd like to upgrade to a 2x4 or possibly a 4x4 kit. Is it possible to run RAM with a lower latency, or does it have to be 11 (or higher)? I emailed G.Skill over a week ago (since that's the brand I planned on going with), but they haven't replied. Can you guys help me out here?