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Corsair SF750 750W SFX Power Supply Review: Best SFF PSU

Today we are reviewing the Corsair SF750 SFX power supply, perhaps one of the best if not the most capable computer power supplies ever manufactured. What is most impressive about the SF750 is the fact that Corsair managed to cram 750 watts of power into the extremely minute SFX form factor. Previously, one of the most frustrating aspects of building in a true SFF (small form factor) ITX computer case was sheer amount of sacrifice necessary. The first SFF power supplies plateaued at around 500-550 watts which admittedly was good enough for most builders but lacking for enthusiasts. Now, Corsair has created a platinum rated 750-watt solution which seeks to be the best SFF power supply. Is it?

Unboxing & Overview

The SF750 comes in a small box labeled with key information such as cables included, power efficiency curves, and a brief feature breakdown. The front of the box has a picture of the SF750 and its ports as well as the 80-Plus Platinum badge and a 7-year warranty badge.

The back of the box describes the components used, the 92mm low noise fan, and extreme efficiency of the SF750.

The top flap has an excellent included cables graphic.

The bottom has your unit’s serial number, etc.

Upon opening the box, we are greeted with an important information booklet and the manual.

The SF750 is tightly secured in some form fitting foam, the custom sleeved black cables are stored next to it and there are additional accessories in small plastic bags.

Speaking of accessories, Corsair includes an AC power cable, several cable ties including Velcro ties, a case badge, an SFX to ATX adapter bracket and a cable storage bag. The included SFX to ATX adapter bracket is an underrated feature that makes the SF750 a future proof purchase for those who believe they may eventually downsize their PC. It allows you to use the SFX sized SF750 in a regular ATX sized case without the need to modify anything. When you are ready to downsize your PC, simply remove the bracket.

Included cables consist of:

Here is the top of the SF750, the sticker you see above the power switch describes the silent mode fan operation. When under low to moderate loads, the SF750’s fan doesn’t spin at all. This is a really great feature when you are using your computer to simply browse the web or work on a document or spreadsheet. Many of us SFF builders place our computer on our desk, so we hear every little noise and anything to cut down on humming, buzzing, etc. is welcome!

On the side, you will see the SF750 branding along with Corsair’s well-known logo.

Here is the 92mm fan which does an excellent job of cooling the PSU when necessary.

The opposite side has the information sticker which details electrical specs such as AC input, DC output, max load, and max power.

Here is a straight on shot of the electrical info section.

As a premium power supply, the SF750 is of course fully modular.

Custom Length & Individually Sleeved Black Cables

Simply put, we love the cables. We have been begging manufacturers to include custom sleeved black cables with their power supplies for years. Black sleeved cables are versatile and infinitely better than typical stock cables which are stiff, difficult to route and either braided together with one thin sleeve or not sleeved at all. This is not as serious of an issue with a large tower case but with an SFF case, anything but custom length sleeved power cables is beyond frustrating to work with. Corsair did a phenomenal job of sleeving these cables and cutting them to the perfect length for small ITX cases.

Corsair SF750 (left) with custom length sleeved cables and EVGA 650 GM (right) with standard length sleeved cables.

The sleeve used is black paracord and is certainly among the higher quality weaves. After a month of swapping between computer cases, the cables never frayed. Cables are extremely difficult to manage in small cases and if you attempt to use full length cables in an SFF case, you must omit additional components such as fans to accommodate the additional cable length. The SF750’s included cables are a perfect length and had no issue fitting in fully outfitted Sliger SM560 and SM580 SFF cases.

Different Variants

The SF series is available in 450W and 600W versions for those who do not require as much power. One thing to note is that the 450W and 600W variants were previously Gold rated and did not come with custom sleeved cables. When the SF750 was released, Corsair upgraded the entire lineup to Platinum and added custom sleeved cables.

Additional Features

The SF750 is outfitted with a 92mm cooling fan which almost never comes on because Corsair has added PWM functionality. Many power supplies still use DC voltage control which is far inferior and does not allow precise fan speeds based on power output. The SF750 has a specific fan curve, see below, that is expertly tuned and is best we’ve experienced on a PSU to date.

The SF750 uses 100% Japanese capacitors and soldered PCBs which no doubt are contributors to the 7-year warranty included with this unit. Impressively, the entire 750W is output over a single 12V rail, delivering clean, efficient power. Over a month plus of benchmarking, gaming, video editing and everything in between, there was never a moment when this power supply let us down.

Performance

We tested the SF750 primarily on our Sliger SM580 build which consists of the following components:

We used the Corsair SF750 in our Sliger SM580 build.

During typical office tasks such as composing emails, browsing the internet, working on documents and spreadsheets, the fan never turned on as you would expect. As we increased the system load during light photo editing and video framing the fan typically remained off but if triggered, operated at near-silent sound levels. Only when we encoded video, benchmarked or played a game that caused system load to reach or exceed 60% did the fan turn on and while audible it is far less noisy than a typical ATX sized unit. Furthermore, under normal conditions we would never hear it anyway as when gaming we typically increase speaker volume to a level that far overshadows any fan noise on the system.

Conclusion

The Corsair SF750 is our choice for the best SFX power supply! It delivers clean, consistent power and remarkably outputs 750 watts in the tiny SFX form factor, putting it in a class of its own. That alone is worth it, however when coupled with the fantastic included sleeved cables and Corsair’s confident 7-year warranty, the SF750 offers an immense and lasting amount value for the money.

For the reasons listed above, we highly recommend the SF750 if you are building a high-end, overclocked SFF PC. It could very well be the last power supply you ever purchase; it really is that well made. We are proud to award the Corsair SF750 our Editor’s Choice Award!

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