BFG MX Series 550W PSU

What's Inside?

Given the size, inside looks a little vacant. There's plenty of space around the components that allow them to breathe and be cooled easily. The heatsinks are plain aluminium, but offer more surface area than OCZ's plain sticks in its ModXStream Pro. With that said though, they don't direct the flow of air towards the back of the exhaust like other solutions, but they are folded over to make sure there's good contact with the airflow.

The Globe Fan is one we've also seen used in other power supply models (its model number is S1202512M) and is rated to work from 6.0V to 13.8V, with a maximum airflow of 81cfm at 2,400rpm and 39dB. Thankfully, BFG knocks it down several notches to a far more tolerable level, with a fan speed below 1,000rpm until the internal temperature reaches 30ºC and scaling up to 1,500rpm at 50ºC. Hitting 50ºC internal PSU temperatures also causes the 60mm fan to kick in for additional cooling over critical components.

The small green PCB screwed to the heatsink behind the power plug has a probe attached to measure the heatsink temperature and adjust the aforementioned fan speeds accordingly.


A quality 85ºC Matsushita main capacitor is used, as well as 105ºC JunFu capacitors. While not a premium "Japanese" brand such as featured in the EX Series and in other manufacturers' units, they shouldn't be too bad and are no worse than what is used by the competition in this class of unit.


The rear fan is also a sleeve bearing Globe Fan (model number: S0801512M) rated to just 23.5dB at its full 2,500rpm, but only pushing a mediocre 25cfm. It's also exceptionally thin at just 10mm, compensated for by using a many-blade design.


The soldering quality is not bad, with some obvious slightly untidy hand soldering on the upper half, but it's certainly not the worst effort we've seen and most of it is quite tidy.