Corsair CMPSU-620HX 620 Watt Power Supply Review

Inside The HX620W

Since this is Corsair’s first production power supply we thought we’d take a peak inside to see what was going on. Corsair informed us that both the HX620W and the HX520 meets EPS 12V Power Supply Guide 2.91 (.pdf) and ATX 12V Power Supply guide 2.2 (.pdf) which requires that the current on each 12v rail not to be over 18A. The guidelines stipulate wiring must follow a “Split Plane” circuit in which 12v1, 12v2 and 12v3 lines come from separate solder points off the main PCB. In the past we have discovered companies not doing this and the only way to check is to open the power supply up!

Everything looked good to go on the inside of the power supply as 12 Volt rail is pulling in power from three different locations on the printed circuit board, so it’s a true three rail power supply. Everything seems in good order inside our Corsair HX620W power supply!

Here is a view from the other side of the power supply. One thing we noticed is that this power supply didn’t have any adjustable potentiometers inside, so opening one up is pointless for consumers as there nothing inside to ever adjust.

The fan used in the Corsair HX620W power supply was the Adda 120mm fan (Model AD12124B-A71GL) 120mm fan for this unit’s cooling.

The fan specifications state that it produces a maximum airflow of 85.2 CFM at 2200 RPM at 39.1 DBA. With most of today’s enthusiast grade power supplies having 120mm or 140mm fans we found that the Adda 120mm fan lived up to our expectations in terms of cooling and noise. That’s it for the inside of the power supply! Let’s move along and take a look at our test systems and try this power supply out.