CX series is listed as TBD on Haswell compatibility chart:
http://www.corsair.com/en-ca/blog/2013/may/haswell-compatibility-with-corsair-power-supplies
I looked that up right after posting my reply to you above.
Honestly, I feel like I lucked out, because I had no idea this was even an issue. I hate to think of all the hell I would've ended up dragging myself through if I ended up with a flaky PC due to incompatible PSU.