What GPU do you plan powering?
Hello all,  I have a Dell optiplex 7010 MT. 32 ram. I7-26600. 2600 I want upgrade not sure how far up the chain I can do this.i have a 275w but I want to go to 640w but have no idea the right brand name. Saw a few post but kept losing them. Any info you can give me would help a lot. 
New poster: looking for power supply upgrade.