Corsair SF750 PSU Review: A Tiny Power Factory

The Corsair SF750 is the strongest and one of the best SFX power supplies that money can get you today. If you want so much power out of such a small PSU and you can afford its stiff price, there is no other option. It can easily support a potent gaming system and thanks to the couple of EPS connectors that it has, it is compatible with high-end mainboards that need more juice in the CPU's area. In case you don't need more than one EPS connector, you should better take a look at the top-notch SF600 Platinum, which we have already evaluated, and save a notable amount of money. Corsair has set the bar too high in the SFX market, making it very difficult for the rest brands to follow. Even the pioneer in this area, SilverStone, doesn't have, for the moment at least, a 750W SFX model in its portfolio.

After the great SF600 and SF450 Platinum models, both of which we already reviewed, Corsair strikes again with the SF750 which addresses enthusiasts and ultra demanding users, who need a strong, but still-compact PSU. Not long ago it would be crazy just to even think of such a powerful SFX unit, but Corsair along with Great Wall, the manufacturer of all SF models, managed to make this happen and they deserve high praise for their efforts. 

In addition to its high capacity, the SF750 offers high efficiency levels, which are verified by its 80 PLUS Platinum and Cybenetics ETA-A certifications. Such a highly efficient PSU doesn't have a problem keeping its noise output low, since the thermal loads are highly reduced. In the Cybenetics scale the SF750 achieves a LAMBDA-A- level, meaning that this product has a fairly quiet overall operation.

Specifications

Manufacturer (OEM)Great Wall
Max. DC Output750W
Efficiency80 PLUS Platinum, ETA-A (88-91%)
NoiseLAMBDA-A- (25-30 dB[A])
Modular✓ (Fully)
Intel C6/C7 Power State Support
Operating Temperature (Continuous Full Load)0 - 50°C
Over Voltage Protection
Under Voltage Protection
Over Power Protection
Over Current (+12V) Protection
Over Temperature Protection
Short Circuit Protection
Surge Protection
Inrush Current Protection
Fan Failure Protection
No Load Operation
Cooling92mm Rifle Bearing Fan (NR092L)
Semi-Passive Operation
Dimensions (W x H x D)128 x 65 x 102mm
Weight0.9 kg (1.98 lb)
Form FactorSFX, EPS 2.92
Warranty7 Years

Power Specifications

Rail3.3V5V12V5VSB-12V
Max. PowerAmps202062.52.50.3
Watts13075012.53.6
Total Max. Power (W)750

Cables & Connectors

Modular Cables
DescriptionCable CountConnector Count (Total)GaugeIn Cable Capacitors
ATX connector 20+4 pin (300mm)1116-18AWGNo
4+4 pin EPS12V (400mm)2216AWGNo
6+2 pin PCIe (400mm+100mm)2416AWGNo
SATA (100mm+120mm+120mm120mm)2818AWGNo
4 pin Molex (100mm+120mm+120mm)1318AWGNo
AC Power Cord (1380mm) - C13 coupler1116AWG-

All cables are modular and it is nice to find two EPS connectors in a SFX unit. This is the first time that we see such a compact PSU featuring a couple of those connectors. Moreover, the SF750 has enough PCIe and peripheral connectors to support a strong system. Finally, all cables are individually sleeved and there are no in-line caps.

Component Analysis

General Data
Manufacturer (OEM)Great Wall
Model NumberRPS0115
Primary Side
Transient Filter4x Y caps, 2x X caps, 3x CM chokes, 1x MOV, 1x CMD02X
Inrush ProtectionNTC Thermistor & Diode
Bridge Rectifier(s)1x
APFC MOSFETInfineon IPZ60R060C7 (650V, 22A @ 100°C, 0.06Ohm)
APFC Boost DiodeROHM SCS306AP (650V, 6A @ 135°C)
Hold-up CapNippon Chemi-Con (420V, 470uF, 2000h @ 105°C, KMZ)
Main Switchers2x 60F2094 (600V, 15.8A @ 150°C, 0.19Ohm)
Driver IC: Silicon Labs Si8230BD
APFC ControllerChampion CM6502UHHX & CM03AX Green PFC controller
Resonant & PWM ControllerChampion CM6901X
Quasi-Resonant ContollerInfineon 5QR1680AG
TopologyPrimary side: Half-Bridge & LLC Resonant Controller
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V MOSFETS6x APower 4N1R8C-A ( 45V, 32A @ 70C, 1.8mOhm)
5V & 3.3VDC-DC Converters: 4x Infineon PSMN2R0-30YLE (30V, 100A @ 100°C, 2.8mOhm @ 100°C)
PWM Controller: APW7159C
Filtering CapacitorsElectrolytics: 1x Nippon Chemi-Con (4-10,000 @ 105°C, KY), 2x Rubycon (3-6,000 @ 105°C, YXG)
Polymers: Nippon Chemi-Con (G61B, G8, G84R, G84G, G85F), 6x Nichicon (LG)
Supervisor ICInfinno IN1S429i-SCG
Fan ControllerPIC16F1824
Fan ModelCorsair NR092L (92mm, 12V, 0.22A, 3950 RPM, Rifle Bearing)
5VSB Circuit
Rectifier1x CSD18534 (60V, 13A @ 25°C, 9.8mOhm)
Step-Down ConverterTexas Instruments TPS54231 (3.5V-28V Input, 2A)

This platform is made by Great Wall and, as you can see in the table above, it uses high-quality components. However, it would be even better if a higher-capacity bulk cap was installed in the APFC converter, allowing for more than 17ms hold-up time.

In the secondary side we find a small number of electrolytic caps, so the majority of ripple filtering is handled by polymer caps. This means increased tolerance to high operating temperatures and a prolonged lifetime under the same conditions. Finally, the cooling fan uses a rifle bearing and it is the same with the ones used by the rest SF models. We expected a fluid dynamic bearing fan to be used in this model, but according to Corsair, the NR092L is reliable enough to survive the seven-year warranty with the help of semi-passive operation.

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