Star citizen has 4k maps on their main player ship models.
They also ran their most recent demo where they confirmed the texture size on a single gtx680 with 2gb with playable fps.
In my experience, overclocking the memory helps the hashrate on the 750ti far more than the core clock.
I'm currently running one at +750 to the memory and clearing 330kh/s with ease.
SilverSliver, were you using a modded bios with unrestricted power limit and/or overvolted your card by any chance?
I've also started mining on a 780ti sc acx since the new Z kernel came out and I can get 750kh/s+ on stock settings but I'm morbidly concerned that I might wreck my new card...