Well it's definitely not a great choice for a psu that's for sure.
I've never read a flattering review of any CM psu of the 460W variety.
They've released a few and none deliver their stated power output and are very inefficient by today's standards.70%
Sounds like it's defective i'd rma it if that's possible.
Much better unit in alot of ways.
CORSAIR Builder Series CX430 V2 430W http://www.newegg.com/Product/Product.aspx?Item=N82E16817139026