If you could post back with that and your other system information it would help to guide you in the right direction.
Which revision is your motherboard?
What BIOS version are you running?
What other hardware (hard drives, graphics card etc.) do you have installed?
I know these things may not seem relevant but the more information you give the better understanding other users who are trying to help will have of your system.
Basically, with your CPU I would recommend that you run at 1333MHz and try to tighten the timings from 8-8-8-24 a little bit to say 7,7,7,24. As with all things PC based there are no hard and fast rules and what works for one system doesn't always work on a seemingly identical one.