Hi im trying to overclock my intel core 2 quad Q8300.

These are my specs:

intel core 2 quad Q8300 currently at 2.50GHz
2x 2gb DDR2 ram
Asus P5QL-EPU
680w psu.
h50 water cooling

in my settings i have
AI Overclock tuner [ MANUAL]
FSB FREQUENCY
PCIE *********
DRAM********
MEMORY OVER VOLTAGE
ND OVERVOLTAGE
CPU VTT
SB 1.5V VOLTAGE
CPU Vcore offset
PHASE OPERATING CONTROL

please help me OC to the max it can go.
thanks
craig