Six years ago Corsair first entered the PSU market with the HX520W and HX620W, both of which products were marked as a great success for the company. Today the company offers 6 series of PSUs but the HX series remains alive, with its modular 80Plus Gold certified units right between the elite AX series and the mainstream 80Plus Bronze certified TX series. In this review we are taking a crack at testing the most popular model of the HX series, the HX850.