Well I have been running a FSP power supply for the nearly 3 years(24/7) without issues(300 watts i5 750 with a 5770
now it has a GTX 650 ti). I do not think they are THAT bad.
a 7770 is very power friendly to be honest.
I have no experience with chieftec or who they use for an OEM, but they seem to have lots of power.
The actual problem with CHEAP power supplies is most time they have all the power on the 3.3 and 5 volt lines. Then when you try to hit the 12 volt lines hard they fail.
I have seen one FSP power supply fail ever and it just shut off and never went on again. No hardware damage no fireworks, just off.