The corsair PSU has lasted around 5+ years and has been faultless - until now.
My lad uses his PC a lot, marathon gaming sessions etc and now uses it for his uni work doing game design. Probably 16 hour sessions daily.
In that kind use cheap PSU using cheap capacitor should be replaced before five years.
Those parts and PSUs simply won't survive enthusiast/heavy duty use.
Likelyhood is good that if you looked inside that dead PSU, you would find blown capacitor or two and more of them bulging.
(semiconductors often go with sharp bang and failing capacitors would be likely root cause)
Quality should be first priority and more oversizing only after that.
While 550W would be enough at least that Bitfenix Formula has only one PCI-e power cable.
So 650W PSU like that Antec Earthwatts Gold Pro or Seasonic Focus Plus Gold would be better.
For any higher performance/power consuming graphics card using separate cables for both connectors is what should be done.
It gives graphics card more stable 12V and better ground reference. (current induced voltage loss happens also on return path)
Also using one cable instead of two quadruples power losses in cable and hence heating of wires.
(power = current^2 * resistance)
