|although i agree with masterofnocrack but here it is.|
ur psu is not enough for high-end graphics cards(gtx560ti,HD6870)
if u want to upgrade, i suggest getting a new psu 500watts with 12V-28A.
why do u want to game on that resolution u could game any game on 1280x1024 on that card perfectly. 1920x1080 requires a high-end graphics card. u want that card do as i said upgrade the psu.
computers are a second home