I doubt a Corsair HX520 can do 700W, tbh. Maybe 600.
Although you can run most PC's on a 350 or 400W PSU, buying one is just pointless. Most of them either don't have enough connectors, or don't have the required connectors, and they don't have much Amps due to physical impossibilities. So while your PC might run off 350W, buying a 350W PSU isn't real intelligent.
Especially if you ever wish to upgrade. A top-of-the-line PC right now will use quite a bit more than 350W, so you'd need a new PSU again. Might as well buy something that will last a long time like a nice 500 or 600W.
Although you can run most PC's on a 350 or 400W PSU, buying one is just pointless. Most of them either don't have enough connectors, or don't have the required connectors, and they don't have much Amps due to physical impossibilities. So while your PC might run off 350W, buying a 350W PSU isn't real intelligent.
Especially if you ever wish to upgrade. A top-of-the-line PC right now will use quite a bit more than 350W, so you'd need a new PSU again. Might as well buy something that will last a long time like a nice 500 or 600W.