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I can't give you figures for this to this... every card is different.
I run mine 1100/1407 @ +50mv (1.25v) for every day, you could try it at those settings, it may or may not be right.
The best thing to do is bump up the clocks by 25Mhz at a time and test various benchmarking apps like 3DMark and unigine
By moving the Mhz up eventually it will become unstable, when that happens increase the core volts by 20mv at a time, you will probably need to reboot at that point as the drivers will be running in an unstable state.
Keep an eye on temperatures, 80c or less is fine. if its an AIB card.
