The Corsair "CX" is unfortunately NOT a high-quality PSU. It reviews well when new, but unfortunately is made with some inferior Samxon capacitors that do not like heat. They tend to fail early.
I'd look for a Seasonic- or Superflower-built unit. For any graphics card with up to a single 6-pin PCIe cable, you'd only need 400W-450W. Manufacturers specify higher minimums in the (often futile) attempt to account for the liar-labeled PSU-shaped objects still being sold (e.g. Apevia, Logisys, Diablotek, Raidmax, Sunbeam, etc).