well a couple of comments for you
in the ram settings
change you ram divider also listed as SPD value in the bios to a value of... "2" this will give you a 1:1 ratio on your ram to cpu instead of the 4:5
next change your ram timings for now to 5,5,5,15 yours are set at 5,6,6,18
also change your TRC value from 1T to
2T
make sure your ram voltage is set atleast to Vdimm 2.0 volts but 2.1 volts would be better
as far as how far you can push this cpu I am thinking 3.6 volts dont see you getting as far as 4.0ghz some fellas have attained that clock on watercooling but they sure as hell dont leave it there 24/7 !!
I am not a real big fan of the OCZ 600 watt power supply for your rig / the OCZ line is much better than the generics on the market but yet they are not on par with numerous models which are on the first and second tier shelves for qaulity
First Tier = Seasonic & PC Power and Cooling
Second Tier= Corsair / Antec Trio Power / Thermaltake Toughpower Silverstone / Enermax Galaxy
Third Tier = OCZ / Coolermaster Real Power Pro / Mushkin /
you need a 750 watt unit to power your rig when overclocking !!
I would sell off the one you have on ebay and get the Corsair TX-750 watt or Thermaltake Toughpower 750 watt