Corsair
SF750 Platinum
AUTHOR:Onie T.
TESTED BY:Lucas N.
Published:

The Corsair SF750 is a 750W fully modular, SFX form factor, ATX 2.4 power supply. It offers a single hybrid fan mode and is priced at a MSRP of $184.99 USD. 

While it is an older model, not designed to ATX 3.0 specifications, it remains a viable choice for its reliable load regulation and build quality. The model we tested (CP-9020186) is not the latest version; Corsair has since released an updated model (CP-9020284) compliant with ATX 3.1 standards.

However, we found inconsistencies between the user guide and the technical specifications on Corsair’s website in regards to the included protections. 

Despite these discrepancies, the SF750 is commendable for its included accessories, flexible cables, and dependable load regulation. This makes it a solid recommendation for users prioritizing compact builds.

WHAT YOU NEED TO KNOW

THE GOOD

  • Form Factor

    As an SFX form factor power supply, it is perfect for small form factor cases. It also includes an adapter bracket, making it compatible with all ATX-supported cases.

  • Load Regulation

    The power supply demonstrated very minimal changes in output voltages even with increased load, ensuring consistent performance.

THE BAD

  • Protections

    It is missing some expected features, such as OPP and UVP, though OPP was still tested for. The user guide and website specifications are inconsistent regarding these protections.

THE REST

  • Resiliency

    It only sustained up to 10 ms at full rated load for 115V and 230V. This is shorter than desired and may not be as resilient to poor power quality.

  • Overall

    This PSU did not excel in all tests, yet it did not fail any either. Apart from its load regulation and OCP, most results were average. It remains a recommended option for its reliable load regulation and SFX form factor.

LINKS
Where to buy*
AmazonNewegg

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Hardware
HardwareNotes

The Corsair SF750 is a compact SFX form factor power supply, making it ideal for space-constrained cases. In the Box, the unit comes with a variety of accessories, including velcro cable ties, an ATX-adapter bracket, and a Corsair case badge. It also features individually braided flexible cables, enhancing ease of cable management. 

For cooling, the power supply utilizes a standard 92 mm rifle bearing fan, ensuring adequate thermal performance. The power ratings and specifications are consistent with expectations for this price range. Somewhat notably, the combined 5V and 3.3V power limit is above average compared to other power supplies of this capacity that we've tested, providing additional headroom. However, Corsair does not specify an operating temperature, and this was not something we could verify through testing.

In the Box

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Front of the box.

Construction

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Power input side of the PSU.

Case Format
Cable Form
Colour
Colour Theme
Case Width
Case Height
Case Length
Case Effective Length
Mass
Fan & Cooling
Top of the PSU displaying the fan.

Top of the PSU displaying the fan.

Cooling Method
Fan Diameter
Specifications
Side of the PSU displaying the specifications.

Side of the PSU displaying the specifications.

ATX Version
80PLUS Rating
Cybenetics ETA
Cybenetics Lambda
Input Frequency Range
Input Voltage Range
Operating Temperature Range
Storage Temperature Range
Cables
1xMotherboard
24-pin Motherboard:
2xCPU / PCIe
4+4-pin CPU:
2xCPU / PCIe
6+2-pin PCIe:
6+2-pin PCIe:
1xPeripheral / SATA
Molex:
Molex:
Molex:
2xPeripheral / SATA
SATA:
SATA:
SATA:
SATA:
Power Ratings
+12 V+5 V+3.3 V+5 Vsb-12 V
CURRENT62.5 A20 A20 A2.5 A0.3 A
WATTAGE750 W130 W12.5 W3.6 W
750 W

Please note that the above ratings are manufacturer advertised specifications.

Features & Software
Features & SoftwareNotes

The SF750 includes a hybrid fan mode, which ensures the fan does not spin until necessary, reducing noise during light loads. However, in terms of protections, the unit does not come with all expected features according to the included user guide. It lists OVP, OCP, OTP, and SCP, with OCP only present on the 3.3V, 5V, and 12V rails. 

While UVP was not tested, we did evaluate OPP, even though it wasn't listed in the manual. There was also an inconsistency in the product information, as Corsair's website lists UVP and OPP but omits OCP from its technical specifications. Despite these discrepancies, the power supply is backed by a 7-year warranty.

Modes
Protections
Over Current Protection (OCP)
Over Power Protection (OPP)
Short Circuit Protection (SCP)
Over Temperature Protection (OTP)
Over Voltage Protection (OVP)
Under Voltage Protection (UVP)
Performance
PerformanceNotes

In terms of performance, the SF750 delivers average results across most categories. However, its load regulation is excellent, with output voltages showing minimal changes even as the load increases. The 12V rail in particular maintained a stable voltage with a drop of only 0.129V, well within ATX specifications. The ripple performance was satisfactory, though the 12V rail displayed a slightly higher peak-to-peak signal ripple of 49 mV, while the 5V and 3.3V rails had lower ripples at 29 mV and 28 mV, respectively.

Excursion tests, while not mandatory for non-ATX 3.0 power supplies, were conducted with reduced percentages. The SF750 managed well in most of these tests, mainly due to its good load regulation, though it did not pass the more demanding regular excursions.

Voltage Ripple
Load Regulation
Power Excursion

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Productivity & Efficiency
Productivity & EfficiencyNotes

The SF750 is 80PLUS Platinum certified, achieving up to 92% efficiency at 50% load. However, many of the results were marginal or just missed Platinum requirements, especially at the top half of the load range for 115V and the bottom half for 230V. Despite this, the unit still sits at the high end of Gold certification, which is not low efficiency by any standard.

In brownout tests, the power supply’s performance was average, maintaining only a 10 ms dropout at full load for both 115V and 230V, which may affect resilience during power fluctuations. The protections tested, including OVP, OCP, OTP, SCP, and OPP, functioned as expected, with OCP triggering on the 3.3V, 5V, and 12V rails at 125% to 140%. The OPP engaged at a maximum of 133% of the rated load, with the 12V rail alone capable of 84A, or 134% of its rating, ensuring the unit could handle power draws slightly beyond its official rating without compromising safety.

Efficiency
Brownout
Brownout/Hold-Up Duration 115 V 60 Hz 20°C
Over Current Protection (OCP)
Test Configuration
Video Overview
Test Bench
AC Source
Automated Test Software
DC Load Mainframe
Dual Channel Loads
Chroma 63610-80-20
Environmental Chamber
Microphone
Multimeter
ON/OFF Controller
Chroma 80613
Power Meter
SC/OVP Tester
Chroma 80612
Thermocouple Scanner
Noise Analyzer
Single Channel Loads
Chroma 63640-80-80

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