Alright, thanks everyone for all the PSU recommendations. Apparently chieftec is an European only brand, so that could explain why a lot of you haven't heard about it. Still, going to be safe and replace my PSU with this one:
http://tweakers.net/pricewatch/256222/seasonic-s12ii-bronze-520w/specificaties/
That one should do the trick, right?
I'm in Europe actually.

Yes this is a good PSU.