This is the same fan that we saw used in the Platimax 1200W version. The 140mm fan is branded EA142512M-0A and is a Twister bearing model. It is rated to 1,500 rpm maximum.
The internal build is very clean and there are several rows of thin black heatsinks to separate the components. This is a synchronous design with a DC-DC design in the secondary. The +3.3V and +5V output are produced by two smaller power supply sub divisions which are both connected to the primary +12V rail. This is to ensure the maximum possible efficiency.
The Platimax 850W design uses a pair of Rubycon 400v 390 uF capacitors, rated at 105c, which is reassuring to see in a design like this. Enermax are using switching transistors controlled by a CM6901 resonant controller. Enermax are using Japanese Chemi Con electrolytic capacitors to filter the +12V output.
The power supply has four +12 rails. Enermax are using a PS232S monitoring circuit which supports under voltage (UVP), over voltage (OVP), and over current (OCP). The cables are fully sleeved into the chassis to protect against long term fraying.