A GeForce GTX 780 needs 42 amps on the 12v rail and a 600 watt power supply.
The Seasonic 620W M12-II has 2 - 24 amp 12v rails and the Proper power connections to run your setup.
The PSU you listed is sufficient to run your setup.
A GeForce GTX 780 needs 42 amps on the 12v rail and a 600 watt power supply.
The Seasonic 620W M12-II has 2 - 24 amp 12v rails and the Proper power connections to run your setup.
The PSU you listed is sufficient to run your setup.