Okay, to start off make sure your cpu is stable, if unstable during stress test, you will know that the cpu isn't the cause of instability.
Leave all your ram timings & everything on auto, then set your freq. to 1866mhz & set voltage @ 1.65v.
Boot up & test for instability, you can try OCCT. If its stable then start dropping the timings one by one.
for eg. start with 10-11-11-36, then 10-10-11-11-36 etc... If one is unstable then leave it be and move to the next i.e. 10-11-10-11-36.
You can try to drop the tRAS from 36 to 28/24
Once you've reached your goal, then you can try dropping your voltage to find out the minimum voltage required.
Quote:
the specific game I wanted it for has had reports of noticeable fps increase from higher RAM speeds
which game are you referring to?
AFAIK, a boost of 133mhz on your memory is not gonna give you any significant boost in any game or application that I'm aware of.