Final Words & Conclusion

Final Words & Conclusion

The Corsair SF750 Platinum is a great 80 Plus power supply that stands out from the crowd of similarly sized PSUs first and foremost with its Platinum certificate.  It’s designed mostly for SFF systems, but you can also use it in an ATX system, with an ATX bracket. The cables are modular, of course, and appear to be more than enough for most users. A 7-year warranty is a plus (but for example Seasonic offers 10 years for their SFX PSU). 750 Watts should be sufficient for most users with a single graphics card in their systems. In reality, a setup like the one used in this test (i7 8700K + Geforce GTX 1080 Ti) rarely exceeds 350 W of power draw. From a technical point of view, the unit is really impressive. Load regulation is great, in fact on par with ATX-sized solutions. There was no noticeable droop on both +5V and +12V rails. Ripple suppression is well within tolerance levels. The 92 mm fan does its job well. It’s audible when close to 75% load, but below that, we can say that it’s really silent (as it’s passive till ~30% load). At full load, the noise is very significant, but most probably buyers of this unit won’t even come close to using this model’s full power potential. The efficiency of this Corsair PSU is really, really good, reaching values from the platinum-level certificate with ease. It’s also nice that they have used Japanese, 105°C-rated capacitors. As for the accessories, you get some zip-ties, velcro strap and a manual. Some of the users could use the longer cables (especially if applied in some bigger ATX chassis), but maybe that's nitpicking, right?

A word about efficiency

Same as with any other power supply, 50% of the maximum load is where the device is the most efficient. At this sweet spot, the Corsair SF750 PLATINUM achieved a bit above 92 % (at 230 Volts). In the case of this particular unit, half of the maximum wattage is 375 W. The average gaming PC with a single graphics card (at least the ones that are usually spotted in Steam hardware polls) usually won’t exceed this value. Don’t overestimate the savings (electric bill) that you can make by going from 80 Plus Bronze to even Titanium. You can assume that the build quality of a more expensive PSUs can be higher, but the differences in efficiency are not that significant. Below, you can find the cost (in EUR) of daily use of a PC (230 Volts, 20 euro cents per kWh of power) with a power draw of 375 W (a higher-end setup with potential overclocking). 

Let's assume that you play games 3 hours a day, 5 days a week, for a full year. Your PC would consume 375 Watts (= a fairly high-end setup). If we assume a cost of 20 cents per KWh of power, you can see that the savings would be close to 8 euros at best for the entire year. This means that you would have to use the PSU for several years to make up for the difference in the purchase price. Obviously, if your PC is on 24/7 it can be worth it to invest in a PSU with a higher-tier certificate, but you need to do the math yourself.  So, summing it up, an 80 Plus Platinum PSU like the Corsair SF750 Platinum reviewed here is a perfect solution. The price is about 150 EUR.

Stability

There really isn’t much to say about stability. The voltages are stable even under higher loads. The 750 W version (there are also 450 and a 650W variants available) should be enough even for dual-GPU setups with cards like an Nvidia Geforce GTX/RTX 1070/2070.

Aesthetics

The Corsair PSU looks very nice with all-black, premium individual sleeved cabling. The modular design lets you plug in only the leads that you really need, and this will certainly improve the looks of your build. 

Final words

The SF750 Platinum retails at 150 EUR, which is not very pricey. It offers attractive looks (though nowadays it’s most likely to be hidden in a shroud), decent acoustics, and excellent build quality. The Corsair SF750 SFX is, without a doubt, one of the finest SFX power supplies that any company has ever made. Considering its compactness (SFX-L form factor), the Corsair SF750 PLATINUM showed impressive results. It remains quiet even at loads up to almost 75%. The fully modular design makes life easier because you can use only the cables that you really need (still - you always plug the 24-pin and 4/8-pin ATX connector anyway). Included in the package, you receive an ATX bracket, some zip ties, and a manual – so all the things that are a “must have”. The 7-year warranty is good, but e.g. Seasonic does offer even 10 years for their SFX solution. We would also like a version with longer cables, more suitable for bigger ATX chassis. The cables itself look fabulous as they are individually sleeved. Overall, we can sincerely recommend this one, it’s a great unit for a good price.

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