Yes you can but make sure your two unlocked cores are stable. Do some prime95 testing. With that OC, the 960 will be able to push the card well. I can't say if it will be to it's absolute limit but pretty close @ 1080p.
U may have to tweak some settings the game auto picks high settings or higher, but my friends stock 1090t and 670 gtx defaulted to high but he didnt bother to tweak his settings, but u should be fine, as its technically a 4ghz x6 and a better gpu than my fruends