Internals

Inside on the primary filtering side we find two Y capacitors and one X capacitor soldered right on the AC socket. Two more Y and one more X capacitors are soldered on the main board, alongside a MOV and two chokes. Dual bridge rectifiers are used in this PSU.


Plenty of rubberized goop can be seen on components that can potentially become noisy.


The largest daughterboard on the PSU hosts the DC-DC circuitry for the minor rail regulation. Four 3R303GM MOSFETs are handling this activity, managed by the uP3861P PWM controller. The same board also houses the IN1T703-SDG supervisor circuit and fan controller. On the opposite side we find a smaller board that hosts the CM6500UNX APFC controller.


The main capacitor here is from TK, rated at 680 uF / 450 V. Additional filtering caps are from Nippon Chemi-Con.


The same PCB is used for all the VITA GM series PSUs.


Only solid state capacitors are used on the modular connector board.


On the back of the PCB we find 6 MOSFETs handling the +12V rail. Soldering quality looks very good.


The fan included with this unit is a Yate Loon D12SH-12 120 mm fan with 7 blades. While according to Yate Loon, this fan has a maximum RPM of 2200, FSP shows the maximum RPMs not exceeding 1000. However, that is at 25 °C ambient temperature.

Overall the build quality of the FSP VITA GM 850 W is very good.