Control panel>power options.
Set it to max perf.
Use the change plan option and drill down through all the options.
Set them to never or always on or whatever it's called.
I got a pc (lame one) that can play most of the latest games at 1080p 45fps.
Specs: i5 3470
Gigabyte h61 s1
4 + 2 gb ram (4 gb at 1600hz, 2gb at 1333 hz)
500gb storage
Inno3d gtx 750ti
Asus optidrive
500 watt cougar psu
Now, the pc (when in game-FC4, GTA 5, BORDERLANDS 2 AND PRESEQ,) turns off the display randomly, you dont know when.
I wonder where or what the problem is... Is it the psu? Gpu? Or the usb ports of the case connected to the board.
Ps. I just changed the mobo. (Formerly asus p8h61 r2.0)(now the gigabyte one)

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic