Ok, so i have a dell Optiplex 9010 with an i7 3770 and 16gb ddr 3 ram, and want to put a graphics card into it for a decent gaming machine. Only thing is that the pc only has a 240w psu, so i need a new one of them. I have a graphics card lying around, its an XFX R9 280x. The box of the card recommends a 650w psu. Do i really need one of such high wattage? Is it worth getting something like a 1050ti and a lower power supply to save money? how much money would i save? Also i know that i wont be able to chuck any psu in there due to dells weird case and stuff, luckily i have a full atx case lying around too.