MSI ATI Hd RX2600XT overclock

[VR777]

Hello! I want to OC my MSI ATI Hd RX2600XT Diamond 512. I overclocked it with factory ATI Overdrive(from 850/1150 to 857/1179), but i don't feel any changes in performance... I tried to OC it with Riva Tuner 2.21, but i don't know what speed to put. Can anyone tell me what speed should i use? My GPU temperature is usualy 20-30c.
Thank you!

 

[theAnimal]

Not every card is the same. Increase the core one step at a time, then test for stability with Furmark, and repeat.