Corsair SF450 (2018) 450W SFX Power Supply Review

Author:Paul Johnson

Editor:Kyle Bennett

Date: Friday , February 01, 2019

The Corsair SF450 SFX is, as you might have guessed from the "SFX" part number, a computer PSU built specifically with small form factor systems in mind. Corsair promises high power density along with "low noise," which are two qualities that many SFF builders are likely looking for. It also brings has Platinum level efficiency and is fully modular.


The first thing we are going to look at with the Corsair SF450 2018 is its packaging, accessories, and documentation. While normally none of these items is a make or break item for a power supply the packaging quite often contains a lot of information about the product we are purchasing. The inclusion of an owner’s manual that provides actual information about our product is also of great help in many situations. Accessories are almost unnecessary with a power supply as the unit is self contained, unless it is modular, but there cases where a manufacturer can include useful accessories to make installation, routing and use more efficient.

The packaging of the Corsair SF450 2018 looks a lot like the packaging we saw on the SF600 2018 recently. The front of the packaging has a picture of a SF450 2018 along with a few seals. This includes an 80 Plus Platinum label which we did not find listed on the 80 Plus website at the time of testing (which was far after these units were released to retail). Other than that, the front of the packaging has some advertising about "Fully Modular DC Cables," "105C Japanese Capacitors," and "Zero RPM Mode For Low Noise Operation," and a seal indicating the unit has a 7 year warranty like with the SF600 2018. When we move to the rear of the packaging, we find more advertising about efficiency and fan noise including graphs for both features. We also see the power table which we have reproduced below. As we move around to the sides of the packaging, we find the connector count which we have also reproduced below.

The power information for the SF450 2018 is right on what we would expect from a modern 450W power supply. Today, we see a single 12v rail rated at 37.5A or up to ~100% of the unit's total capacity if necessary. When we look at the minor rails, we see that this unit has up to 15A available on the 3.3v rail and up to 20A available on the 5v rail with a cumulative cap of 100W. Paired with this output, we find 2 PCIe connectors, 3 Molex connectors, and 4 SATA connectors. This seems rather meager in a lot of ways. However, this is just a 450W unit and it is a SFX power supply as well. The systems that this unit will be used will rarely need more connectors than this. So while we could complain a bit about this, we can not complain too loudly about how this unit is appointed today.

Once we open the packaging of the SF450 2018, we see the usual assortment of items including the power supply, power cable, mounting screws, zip-ties, flash drive, user manual, warranty card, "Important Information," and an ATX adapter plate. In fact, this is all identical to what we got with the SF600 2018 we recently reviewed. When we look at the paper products, again, we see that Corsair has included the same 100 page long user manual and, just like last time, all that is in this manual that is written in 10 languages are installation instructions, connector counts/lengths, power table, the fan curve we saw on the package, and the efficiency curve we saw on the package. Personally, I love paper. It has this great visceral feel to it when you hold. So, from that perspective, this documentation is great. From any other perspective, it is kind of not great. Let's move on then to the Build Quality and see how the SF450 2018 looks there.