Question Bitfenix or Corsair

Actually, it's ten years.

CORSAIR offers a ten-year warranty on all RMx series power supplies, your guarantee of reliable operation that will last across several system builds. If you run into any problems during the installation or use of an RMx power supply, CORSAIR global customer support is ready to help.

I wouldn't trust ANY Aerocool power supply for ten minutes, much less three, five or ten years.

Aerocool has a few decent product lines, like their DS fans, and a few likable cases, but power supplies are not something you want to buy from Aerocool.