My friend wants a computer that can also play a few simple games like Minecraft and Gmod. Being as she doesn't really have a way to make any money (Still too young to get a job) she will be very limited in price. I eventually settled into the idea of an older OEM PC (i5-2400 CPU) and slapping in a cheap, low-power card such as the GeForce GT 730. The GPU is rated to used about 23 to 49 Watts. Is there anyway possible for that to run on this type of PC's 240 W PSU? If I would need to upgrade PSU, what would I need to get? I am trying to keep the costs as low as possible. Possible Computers will be one of these below (Hopefully the mini tower so I can install the GPU).