I've just relaxed the RAM to 8-8-8 and I'm going to give that a shot.
For some reason, Crysis now doesn't even want to start
so I'm going to try another game and see what happens.
I just played about 20 minutes of Warhead with the 3.8 CPU and the RAM at 1600, but I like my 3.9GHz 24/7 clocks and the difference from 7-8-7 to 8-8-8 is 0.04 ns in Everest latency (ie. nothing)