You need to add ALOT more info.
Is it your sig rig?
I'd wager heavily, your psu is at its limit... Its not a good brand, so I doubt its pushing a solid 400W.
Now, as youre stock at 3.0Ghz, and I assume youre still stock cooling, 3.5Ghz might be possible...
Up your fsb 50-75mhz per test. run prime95 or intelburntest to stress the cpu... keep it under 60C
What is your current Vcore? cpu-z will tell you that.
Also turn off est1 and speedstepping off in your bios.
I'm actually not expecting you'll need to bump your Vcore... But also remember youj'll need to manually set your ram speed to factory...... Are you sure you have ddr3 ram??
g/l go slow, watch temps. I'd first o/c the cpu, then go gpu.