Well, I've been looking for an answer all over internet, but I can't seem to find a decent one. I know what CAS latency is, but what I'm wondering is how much would it change my daily life computer performance if I bought a DDR3-1333 RAM with 9-9-9 or 7-7-7.

All I can find is really old benchmarks and plain explanations I've already memorized. If I can, I may request a benchmark of CAS latencies. (With same frequencies, of course.)