Internals

Right after opening the SF750 you can see that the manufacturer really had to make use of all the available space in this form factor. From the low profile fan to the double floor component mounting, making a small high performance unit does not leave much empty space.


Starting from the AC filtering side, we find two Y and one X capacitor on a small PCB that houses the AC inlet and the power switch. One additional X capacitor, as well as two chokes and a MOV are installed next to them on the main PCB. Ample quantities of glue is used around chokes and capacitors.


The vertically most prominent part of the PSU is the separate DC-DC converter board. Besides housing four AP4024GEMT MOSFETs being handled by the APW7159C PWM controller, and the IN1S429I-SCG supervisor circuit. On the opposite side of the board we find a PIC16F1824 controller, presumably responsible for controlling the fan speed.


At the very center of the board we find the CM6502UHHX APFC controller.


Besides the main bulk cap from Rubycon (470 uF / 420 V) there are just a couple more electrolytic capacitors (Rubycon's YXG series).


Other capacitors used in the PSU (including the numerous capacitors on the connector board) are solid state polymer capacitors. It's worth mentioning that the connector board has two more empty spots for connectors and at least eight more spots for filtering caps. Those are most likely used with the 850 and 1000 watt versions of the Corsair SF series PSUs.


The bottom side of the SF750 PCB houses plenty of components. Underneath a thermal pad we find four 010N04LS6 MOSFETs for the +12 V rail, driven by the NSi66.

While the PCB of the PSU could have used an additional cleaning cycle, the overall build / soldering quality of the unit is great.


When it comes to cooling the SF750, Corsair includes their own branded 92 mm NR092P fan (12 V, 0.22 A) with FDB bearing. It is a lower profile fan (15 mm compared to the 25 mm size), which does support PWM out of the box and features a 4-pin cable. In their specification Corsair mentions that the fan emits just around 32 dB of noise with the PSU being fully loaded, which could be considered very quiet, especially for such a small unit converting 750 watts of power.