unstable

[shadrach47]

I oced my Q6600 to 3.0 ghz and ran orthos and it was stable so i changed my memory timings to 4-4-4-12-2t at 2.1v. Now my computer locks up and freezes when the computer is idle. I ran orthos again last night and today my computer was off so i figured that the test failed. I'm going to change my memory times back to normal and see if it helps. Not sure if its the problem or not, anyone have any ideas? Also is it ok that my fsb to dram is 5:6? thanks in advance.