What is a stable OC for 5770 without voltage increase?

[JaredzzC]

Hi guys.
I currently have a 5770 and wanting to OC as i dont plan on spending more money for a better graphics card.
Of course im not expecting it to be a HUGE improvement but even a lil' would help.

Here are my specs:

Intel i5-2500@ 3.7GHz
12GB DDR3 @ 1333Mhz
(GA) PH67-UD3-B3
Win Power 750Watts
Liquid Cooling
PowerCooler 5770 1GB GDDR5
Windows 7 Home Premium ( 64-bit )

I play games such as Crysis, Crysis 2
BFBC2 and BF3 (when it comes out).
Also FSX ( Flight Simulator X )
The new version of FSX is coming out 2012 hopefully by then i would of got a better GPU
I also play online games, but thats not to worry since my Specs obviously are capable of playing a vast majority.

Many thanks!

 

[JaredzzC]

***Resolution: 1600x900***

 

[geekapproved]

A stable overclock without voltage would be CCC limits.