I recently purchased a refurbished Optiplex 780 desktop. It came with a intel core 2 duo E7500 @2,93GHz, a 2GB GT 710 and 8GB RAM. I've been able to do lots of things on this computer relatively well but gaming is definitely lacking. I heard that this model can handle intel core 2 quads and I think a Q9550 would do well and maybe a GTX 750TI. I'm not that good with computers but I found out that I might need a new power supply for the CPU and GPU since my 255W power supply isn't enough. What should I do? I'd like to run overwatch at around 70fps on (preferably) high settings - as of now I'm getting 30fps on the lowest possible settings.