My CPU was OC by the factory to 4.0 Ghtz. I think i can get more. They set the bus speed at 133 Ghtz with a multiplier of 30. From Youtube, I see many people go with a higher bus speed and a lower multiplier like 28 with a bus speed of 166. I don't know the advantage of 1 vs the other.I really don't know much about computers, but can I raise the bus speed here to say 150 with a 30 multiplier. I have the Asus Rampage II extreme board and the the 990X cpu. I have a liquid cooled maching. It seems I am running at 38 deg C and with FSX running the temps don't see to climb much. The factory was relluctant to go any higher saying it was unstable - but I suspect they were worried abouttheir 3 year warranty.

I would recommend posting in some specialized OC forum, just because it's more likely you'll get feedback there from other Gulftown users.Most of those chips do 4.2 - 4.4GHz on safe volts, just make sure you do your homework and the necesary reading before doing anything.As for the bus, no point in messing with it. If you up the bus, everything connected to it (CPU, RAM, Uncore, QPI Link) is sped up with it and can lead to an unstable overclock very easily. What you want is to isolate the CPU and bump the CPU multi so that everything else remains the same. You may need to up your Vcore or Vtt if you have headroom for that. What is your full load Vcore now? (check in CPU-Z while stress testing the CPU with Prime95, OCCT, Linx or similar test app)