Hey, I have a Gigabyte 78LMT USB3 Motherboard, and I've been told by a TigerDirect online service rep that it won't be able to use an EVGA GeForce GTX 750 Ti GPU. Is this true? If so, what are some GPUs of the same or lower price that offer performance to rival an ASUS Radeon HD7770, which I'm returning due to general driver and card issues/framerate lockage.