Yes. The Dell PSU is small because of the lack of expansion slots and bays in the smaller models. The GTX750Ti is very popular because it doesn't need a PCIe power cable.
It gets stretched a little thin depending upon the game at 1080P but below that it runs well. You will want a UEFI version. Do some measuring if the card is more than 1 slot wide.
The card may not face the way you think it would.