IIRC, the 780 uses a microATX/ITX case. It has only low profile expansion slots with an ITX power supply. If you are looking for upgrades, the one you need to get is SSD. Every computer can benefit from the speed of the SSD. There doesn't seem to be much you can do for the processor but you can install a better graphics card as long as it is a low profile card and the PSU is large enough. ITX PSUs are hard to come by in large wattages. Therefore, you'll probably only be able to put in a GT 730 at best.