The new sleep states are mainly for laptops and usually come disabled by default on retail motherboards. I rarely go by shopping sites reviews you never know how competent the reviewer was or what hardware configuration they ran. The CX series starts strong out of the gate its later on that the cheap secondary caps start to degrade and cause problems, which is why even though it has good reviews(professionally done reviews), it not really recommended anymore. For me the Seasonic would be an easy choice over the Corsair. The only Corsairs I would suggest are the AX(i), HX, and TX.