Silverstone ST56F enough power for GTX770?

[Lynixx]

as per titile, i'm thinking to upgrade my old HD6870 to GTX770 without changing my psu.

will it have any problem with it?

here is my specs:

i7 3770
4x2GB Ram
1x 1TB WD Black
Silverstone ST56F 560watt power supply
5x 120mm Cooling fan
1GB 6870(currently using)

 

[potpolima]

its enough at this moment but replace it sooner because psu wears off overtime...

 

[Lynixx]

how bout 280x?