Hello. Im buying sind new Hardware for my PC, i never did it before. I don't have much money. I was going to buy the gtx660ti, and a PSU, because the one I have doesn't even have a Pcie connector. My Pc would be this: i5 650, gtx 660ti, 8gb RAM. Would the be quiet pure Power l7 be okay? I know that its not a new PSU but would it be enough for my old components? I know, you shouldn't buy cheap PSUs but for my one it's okay?