The GTX1050Ti runs off of the PCIe slot ( be sure and get one without the 6 pin PCIe needed). The MTs usually came with a 305W PSU. The card sellls for $150 so you should be able to get a 305W PSU if needed. But generally Dell PSUs are very conservatively rated. It's a 75W GPU, and Optis generally have a 95W CPU limit so your at 160W for those 2 parts. That leaves 80W for the little stuff. Should be OK.