Seasonic SS400BT PSU is enough for hd 7770 or gtx 650ti?

Solution
But your GPU of choice only requires 400W, so what's the problem? The 450W Corsair will in theory give you more headroom, but you probably won't need it unless you're planning on upgrading some things in the future. Seasonic is the better PSU builder of the two in my opinion, which is why I said I would go with them.
But your GPU of choice only requires 400W, so what's the problem? The 450W Corsair will in theory give you more headroom, but you probably won't need it unless you're planning on upgrading some things in the future. Seasonic is the better PSU builder of the two in my opinion, which is why I said I would go with them.
 
Solution