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Corsair

CORSAIR SF850 (2024) Fully Modular Low Noise ATX Power Supply – Black

  • Based on 163 reviews
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Availability: In Stock.
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Arrives Thursday, Oct 22
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Style: SF (ATX 3.1 & PCIe 5.1)


Size: 850 Watts


Features

  • 80 PLUS Platinum Rated SFX Power: Massive Platinum-rated power in a compact SFX form-factor, perfect for the most power-dense small-form-factor PCs or saving space in larger cases
  • ATX 3.0 Compliant & PCIe 5.0 Ready: Compliant with the ATX 3.0 power standard from Intel, supporting the PCIe Gen 5 platform and resisting transient power spikes
  • Fully Modular, Type-5 Micro-Fit PSU Connectors: With flexible cabling, taking up less space for tidy cable management and compatibility in small cases
  • 92mm PWM Cooling Fan: Delivers powerful cooling with low-noise operation thanks to a fluid dynamic bearing
  • 105C Rated Japanese Capacitors: For unwavering power and reliability

Description

Give your high-performance SFF PC the power it needs with a CORSAIR SF Series 80 PLUS Platinum SFX Power Supply. ATX 3.0 compliant and PCIe 5.0 ready, the SF Platinum Series delivers high-wattage 80 PLUS Platinum-certified power in a compact form-factor with a fully modular design. A 92mm PWM cooling fan ensures quiet operation, with Zero RPM Mode support for no fan noise at all at low loads. Built exclusively with 105°C rated Japanese capacitors, the SF Platinum Series easily handles high-stress gaming and computing. Includes an SFX-to-ATX bracket for installation in larger cases and a seven-year warranty for total confidence.

Model Name: SF850


Brand: Corsair


Compatible Devices: Monitor


Connector Type: ATX


Output Wattage: 850 watts


Form Factor: SFX


Wattage: 850 watts


Cooling Method: Air


Item dimensions L x W x H: 4.92 x 3.94 x 2.5 inches


Item Weight: 2.3 pounds


Compatible Devices: Monitor


Connector Type Used on Cable: ATX


Output Wattage: 850 watts


Form Factor: SFX


Wattage: 850 watts


Cooling Method: Air


Power Supply Design: Full Modular


Connector Quantity: 7


Current Rating: 10 A


Number of Fans: 1


Fan Size: 9.2 centimeters


Maximum Input Voltage: 12 volts_of_alternating_current


Minimum Input Voltage: 100 volts_of_alternating_current


Upper Temperature Rating: 105 °C


System Bus Connector Type: ATX


Item Highlight: Low-Noise, Fully Modular, 80 PLUS Platinum, Zero RPM Mode, SFX-to-ATX Bracket Included, NA


Model Name: SF850


Brand: Corsair


Number of Items: 1


Unit Count: 1 Count


Manufacturer: Corsair


UPC: 840006663317


Built-In Media: Item


Model Number: CP-9020256-NA


Mfr Part Number: CP-9020256-NA


Warranty Description: 7 Year Manufacturer


Item Dimensions: 4.92 x 3.94 x 2.5 inches


Item Weight: 2.3 pounds


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Oct 22

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • Great SFX PSU. Love these models. Cannot recommend enough.
Style: SF (ATX 3.1 & PCIe 5.1) Size: 850 Watts
This is my second Corsair PSU for a Lian Li A4 build, and I love this model. It's true SFX size, which makes cable management a breeze, and it looks great. Noise is minimal, especially with daily tasks like web surfing. There are no frame drops when gaming, unlike the PSU this replaced, and it has great power deliver. Corsair is not the cheapest SFX PSU, but I've ad the best performance out of them and would recommend them without hesitation. ... show more
Reviewed in the United States on September 27, 2026 by Adam
    • Almost perfect
Style: SF (ATX 3.1 & PCIe 5.1) Size: 850 Watts
This is a great SFX PSU. It works so well in my smaller ITX/mATX cases. It is easy to setup with the modular capabilities. It keeps cool for its size and happens to stay quiet. The cables are a bit on the shorter side, and that is the only thing that keeps it from being perfect. But for my purposes they were long enough, although the CPU power cable was a at its max. Performance wise ithe SF850 has had no issue handling my 9950X3D and 7900XTX both being pushed to their limites. It stays relatively cool and perfectly quiet even during long gaming or compiling sessions. Performance: 5/5 Build Quality: 5/5 Cables: 4/5 (due to length) Overall: 4.5 ... show more
Reviewed in the United States on March 27, 2026 by Clintre
    • Corsair quality all the way...
Style: SF (ATX 3.1 & PCIe 5.1) Size: 850 Watts
Review Image by LD
I've had my last few rigs in the Lian Li 011 mini (OG version) so I need SFX PSUs. Prior to this I had the Cooler Master V850, which served me just fine for the last couple of years. However, recently I upgraded all my Corsair fans and AIO to the new LINK ones and the controller requires a PCIe power cable connection as SATA is insufficient for the power requirements. The CM V850 did not come with enough PCIe cables. Sure, I could have bought another cable but I'm actually glad I bought this Corsair PSU instead, it was definitely an upgrade over the V850. First of all, the included cables are braided and are very nice, that alone was worth it for me. In addition, the Corsair has 5 PCIe ports and includes 3 standard type 5 PCIe cables, 2 CPU cables, and a 600W cable for modern GPUs (this was a nice surprise for me when I opened the box, I didn't know it came with this PSU). That allowed me to get rid of the nVidia adapter I was using, which further cleaned up my case. All in all I'm very pleased with this PSU, its dead silent and the cables are amazing. ... show more
Reviewed in the United States on January 5, 2026 by LD
    • Excellent PSU, short cables (of course)
Style: SF (ATX 3.1 & PCIe 5.1) Size: 850 Watts
Review Image by Leandro Salomon
I didn't trust the short cable comments. I was wrong. I bought this because I wanted to start with something for a future SFF pc. And this is ideal because my old PSU had many years and with some issues. I have a mid tower case and this cables doesn't work. I order a new kit because if not it's really impossible. But I think it's expected since this PSU IS for SFF builds. ... show more
Reviewed in the United States on March 25, 2026 by Leandro Salomon
    • Great power supply
Style: SF (ATX 3.1 & PCIe 5.1) Size: 850 Watts
I am satisfied with the power supply. The cable length is perfect so my sff pc, this helps with cable management. It is very quiet I can barely hear it. And 850w is enough to future proof my pc.
Reviewed in the United States on April 3, 2026 by Amazon Customer
    • Great product, but received used and incorrect units multiple times
Style: SF (ATX 3.1 & PCIe 5.1) Size: 850 Watts
These are great units, and I appreciate the shorter cabling for SFF builds. However like some other reviews mention, I received a used item that was completely the wrong model -> Purchased the SF850 (2024), received an older SF750 (non 2024) in the SF850 box. Amazon was great about sending a replacement quickly, but each subsequent attempt continued to have issues (item was shipped in a bag and beat up, more used items, missing cables, etc). Perhaps you'll have better luck, but after my fourth attempt I gave up and bought locally instead. Be sure to check your received item carefully, including that it's the correct item, signs of use, and that it comes with all cables as described. ... show more
Reviewed in the United States on February 25, 2026 by timmeh
    • Still one of the best
Style: SF (ATX 3.1 & PCIe 5.1) Size: 850 Watts
The Small Form Factor has always been limited. Corsair was always the king in the psu space. To save a few bucks I tried another brand, it starts with Thermal..... the first unit was ear piercingly loud, not coil whine, but like a dog whistle for humans. Replaced it and the second unit did the same. Shelled out the few more bucks for the 2024 Corsair 850W and lost a few watts, but its and its perfect. I know most. if not all power supplies are made by the same 2-3 companies, but whoever Corsair is using, they picked the winner. Also it comes with 3 PCIE cables, unlike a few other brands. ... show more
Reviewed in the United States on March 27, 2025 by John Carabetta
    • Lian li a3 Corsair sf850
Style: SF (ATX 3.1 & PCIe 5.1) Size: 850 Watts
Pretty crazy the size of this psu!!! Heads up cables ARE short no 600w output from psu, but comes with x2 8pin split from psu to a 12vhpr for your gpu, it can and will get warm if your pushing new hardware, plan was to use in lian li a3, 9800x3d 7900xtx 2 gen 5 2tb nvme 9100, 4 case fans, montech hyperflow silent 360 aio, lian li 8.8 universal screen, x2 external 2tb nvme USBC and 1 sata ssd, powers the hardware without issue but was only able to mount the psu sideways, waiting for extended cables will update ... show more
Reviewed in the United States on April 27, 2026 by Brian

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