Is it better to run my memory at 1600mhz using XMP with the default 7 8 7 24 timings, OR lower the memory multiplier to keep it slightly below 1333 (1280) and use 7 7 7 24. My system becomes unstable if I use XMP AND tighten the timings.
Unless I'm mistaken, the timing is actually the number of clock cycle needed to do some operation. Therefore if you try to minimize the timing/clock ratio, you should get better performance. This does not account for RAM/CPU synchronicity performance loss however.