CX units are tier 4, lousy, as seen in this conversation and on the tier list I linked to. They have a very high failure rate, especially for a big name Brand. Corsair, Cooler Master and Thermaltake all have very poor power supplies aside from their highest end offerings. I'd avoid them all and look for particular models made by Antec, Seasonic, XFX, Super Flower, EVGA or Rosewill Capstone series units. If it's not listed in a position of Tier 1 or 2 on the list I linked to previously, then it's probably not a unit that should be considered for use with a gaming card or with an overclocked system.
http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list/page-14.html
And actually, the beginning of the tier list conversations start up almost immediately about the CX units. Much as they ended on the old tier list.