Dejan_3 :
The power supply is 80+ bronze so it cant be that bad i guess
The problems with the efficiency ratings:
It's self policed, you can fake the rating and get away with it.
It's no indicator of actual product quality. I can slap a Titanium rating on the the worst known PSU and more than likely never be challenged to the level I have to stop.
By worst known PSU, I mean one that cannot deliver clean power within ATX specs and/or deliver the rated power. Worse yet, my worst known product may take out your expensive parts and potentially catch fire. (Usually these don't get more than an 80+ or 80+ bronze rating if any, but some do get silver or higher.) These are Tier 5 PSUs and best avoided at all costs.
Unfortunately Chieftec ISN'T known for quality among knowledgeable people. (it isn't hard to become knowledgeable, and in fact I encourage becoming so.)