Graphics card and power supply

Hi all.
I decided on the parts to upgrade your PC.
I have a choice between sapphire 570 8gb(185w) and sapphire 580 8gb(225w). The question is what will power di my current PSU my whole system 580 ex? The food is bad fumble, but if I put my 570 it just won't be a problem, only fps).
I5-6500
Mat. H110m-k
BP - i arena series chieftec 550w