Quick question about Graphic cards and PSU's

[Wizie]

Hey, a friend of mine is upgrading his GPU from a GTX 660 to a GTX 780.

We were just wondering if his PSU would be strong enough to handle the upgrade?

He's using a Raidmax RX-535AP atm.

If it won't be enough, what should he get instead?

Thanks

[Denpepe]

From what I can see it should be sufficient even though I haven't heard of the brand b4, wattage seems high enough and has all necessary connectors