Under the Hood
Here are a few pictures showing the layout and components inside the Corsair Professional Series HX850 power supply. The overall layout and component selection looks very good. Corsair appears to once again be using CWT as the OEM for the Professional Series HX850.
A pair of Nippon Chemi-Con KMR electrolytic capacitors are used on the primary, both rated for 390uF, 420V, and 105°C. The secondary side features both solid polymer and electrolytic caps made by Nippon Chemi-con.
The DC-to-DC converters that produce the +3.3V and +5V outputs from the +12V rail are located on the modular cable connector board along with additional solid polymer capacitors for filtering the DC outputs.