A 750Ti can get 60fps on BF4 ultra 1080p.
Would you mind running ungine heaven (I'm more familiar with it and know my way around its results).
You ought to get at LEAST a score of 1500 all maxed out 8 times AA. If you don't, you might have a dead card. My advice is to post a thread in the graphics card forum where people will know more about this than me, because my "field" is GPU overclocking, not troubleshooting, sorry.