What is the stable overclock for my system?

Johnvher

Honorable
Apr 7, 2013
18
0
10,510
As what the title said,what is the most stable overclock of my system
My Current Specification are:
ASRock G31M-S Motherboard
Intel Core 2 Duo E7220
Nvidia GeForce 8500 GT
2GB DDR2 Ram
Standard Temperature CPU:45 Degrees
Current CPU clock:315 GHz
AMI Bios (i forgot what version it is)