I always use MSI Afterburner to OC my nvidia and there is not a single problem until now
. For a little OC, I would recommend 950/1650.
Ok, thank you guys for your advice. I have downloaded MSI Afterburner and I'm playing around with it now. But one thing, as I'm a GPU overclocking n00b when I've increased the memory clock, so far up by 352Mhz then run 3DMark 11, the increase in memory shows up going from 3000Mhz to 3500Mhz, but the increase in core clock doesn't show 3DMark still shows 705Mhz???
So do I need to increase the core voltage or the power limit???