Finding a good SFX PSU can be an arduous task for most looking to build a SFF(small form factor) PC. Therefore in this article, we have reviewed the best SFX power supplies for mini ITX and SFF cases. We have also included the best SFX-L power supplies for those who have a bit more room depth-wise in their ITX or SFF case.
We have included SFX PSUs with a wide variety of wattage options. These power supplies are also modular allowing you to only add the cords you need which is great for micro ITX and other small form factor cases due to the already limited space.
Best SFX Power Supplies
EVGA SuperNOVA 650GM
EVGA is a well-known brand in the computer industry, and their main hardware strengths are GPUs and PSUs. The SuperNOVA lineup of power supplies has long been considered some of the most durable and best-performing PSUs out there. The 650GM is their SFX option, and it’s definitely one worth considering.
To begin with, this is a 650W power supply that’s 80+ Gold rated. This means that you can expect at least 90% efficiency under typical loads, which is quite good for a power supply with this price. To add to this, it comes with a 92mm fan with double ball bearings, which is near silent and will last you a good while. EVGA gives you a 7-year warranty on the PSU, so you should be more than good to go.
Last but not least, the PSU is fully modular to help a bit with cable management and comes with all the heavy-duty protections you need – OVP, UVP, OCP, OPP, and SCP. Overall, this is one of the best SFX power supplies out there.
Corsair SF Series (450W, 600W, and 750W)
Corsair has been around in the PSU game for quite some time now, and they’ve got a pretty extensive lineup of models. Among them is the SF series, which are SFX power supplies, and more specifically, the SF450.
You get to choose between 450W, 600W, and 750W, so you can get the right power supply according to the components you’ll be using.. Add to this 80+ Gold rating, and you’re looking at an extremely reliable power supply that won’t be affected by the extra heat from the compact case.
The electrolytic capacitors inside are 100% Japanese, which is a testament to the quality, and all internal components are very high quality. The fan can go into a zero RPM mode, making it virtually silent when it’s not under load, and the 7-year warranty ensures you won’t be swapping out the PSU anytime soon.
Oh, and did we mention it’s fully modular, which means your cable management job will be made much easier? Yes, this is an excellent pick for just about everyone who needs the best SFX power supply.
Even though they’re not that popular among the mainstream market, SilverStone has some really nice power supplies at very reasonable prices. The ST45SF-V3 is a prime example of that, coming in at a reasonable wattage for a modest small form factor build, and a very attractive price.
As the name might indicate, it’s a 450W model. You won’t be running a high-end GPU with it, but if you’re building an entry-level rig, it should have you covered. The rating is 80+ Bronze, which does explain the wallet-friendly price to some extent, but it’s still a very respectable rating. What we aren’t really fans of is the fact that this isn’t a modular power supply, so if you’re tight on space, cable management might be an issue. This does depend on your case, however, so your mileage may vary.
The 92mm fan is pretty silent, even when the power supply is under load, which is a nice addition. When you factor in everything we said so far and add to that the price, you’re looking at a pretty good option for quite a lot of users who are building a micro ITX build.
Thermaltake Toughpower SFX450W
There’s no denying that Thermaltake is among the pricier brands out there when it comes to choosing a power supply. Oftentimes they set high prices while not offering too much extra over the competition, which leads people to wonder whether or not their power supplies are worth it. Well, if you’re looking at the SFX450W, yes, it’s definitely worth it. It’s only a few dollars more expensive than its main competitors, but it’s very much worth the price.
To begin with, this is a 450W power supply with an 80+ Gold rating, which means it’s very reliable under load. 450W should have you covered for an entry-level or midrange build, and the entire PSU is built with high-quality Japanese capacitors, so it’s going to last you a good while. Thermaltake themselves give you a 7-year warranty, which is pretty good.
The fan is a zero RPM model, which means that when you aren’t pushing the PSU, it’s going to be silent. There’s also the fact that this is a fully modular power supply, so you can go ahead and only use the cables you need. Overall, while slightly pricier than the competition, the Toughpower SFX450W is an excellent power supply.
If you thought that small form factor cases and builds can’t be high end and require a lot of power, you’d be very much wrong. With that in mind, few power supplies can give you the amount (and reliability) of power that you’ll get from SilverStone’s SST-SX700-G.
This is a 700W power supply that checks all the boxes for a good SFX model. To begin with, it’s 80+ Gold rated, which means it deals with heat very well and doesn’t compromise on reliability. In addition to this, you’re looking at all-Japanese high-quality capacitors, so durability won’t be an issue either. The 92mm fan is silent running, and when you’re not pushing your system, the PSU will be near silent.
And to add to this, you have a fully modular design with excellent cables that make cable management a piece of cake. The single +12V rail has a very strict 3% voltage regulation, and low ripple and noise, so overall you’re looking at an excellent power supply. If you need that much power, you’ll be hard-pressed to find a better option, even at the somewhat high price.
Enermax Revolution SFX 550W
It’s very possible that Enermax isn’t the first brand that springs to mind when you’re looking to get yourself a new power supply, but in the past couple of years, they’ve been making some really good power supplies and then making them available for very reasonable prices. An excellent example is the Revolution SFX, which comes in at a price much lower than its competitors. So, what do you get with it?
As the name suggests, you’re looking at a 550W power supply which should run most midrange builds today, provided you don’t have any power-hungry components. It’s rated at 80+ Gold, which speaks volumes about its reliability, and it’s made completely with high quality Japanese electrolytic capacitors.
To sweeten the pot even further, you’re looking at a fully modular power supply with a semi-fanless operation. If it’s under 30% load, the fan shuts down as it’s not really necessary, which does help keep the noise at a minimum. Overall, if you’re looking at a 500-550W power supply for your next compact build, the Enermax Revolution is an excellent budget pick that doesn’t cut any corners and checks all the boxes for performance and reliability.
FSP Dagger Pro 650W
You may have not heard of FSP, but an interesting fact is that they’re behind EVGA’s SuperNOVA power supplies. And even though they’re a competitor to the Dagger Pro, they’re actually built on a different platform. It’s got a few things going for it that justify the price rather easily, so let’s take a look at it.
What’s interesting about the FSP Dagger Pro is the fact that it’s one of the very few SFX power supplies that have two EPS connectors. If you’re building an entry-level system, this shouldn’t concern you much, but high-end motherboards and power-hungry CPUs will appreciate this.
You’re looking at a 650W power supply, which should be able to run most midrange builds today without many problems, and it has an 80+ Gold rating. It also comes with all the protections you could think of – OVP, UVP, OPP, OTP, OCP, and SCP, as well as an active PFC. When you factor in that you’re also getting a 92mm double ball-bearing fan, as well as a fully modular design, this is a truly impressive power supply that’s more than worth its asking price.
When you’re building a new system and ask an experienced builder where you should cut down in order to save a few bucks, the last thing they’ll say is the PSU. And we agree, it’s a very important component that could cause problems if it fails badly. On the other hand, sometimes you’re just very limited with your budget, and can’t afford a well-known brand. If that’s the case, the APEVIA SFX-AP400W might be the option to go for.
This is a 400W power supply with no clear rating, so it’s safe to say that you shouldn’t be using it to run any power-hungry components. It’s cooled by a single 80mm fan, which does calm down a bit if it’s not required, so your PSU won’t sound like a jet engine taking off when all you’re doing is typing a text document.
Unfortunately, but not unexpectedly at this price, this isn’t a modular power supply, but all cables are sleeved so they do have some kind of protection. You will get the main power connector, a 4 pin 12V, a 6/8 pin PCIe, two SATA, two Molex, and a single Floppy connector. At the end of the day, unless you’re really strapped with your budget, you’d be better off with a better model. But if you’re limited, go for it.
Best SFX-L Power Supplies
SilverStone 500W SFX-L
Silverstone’s power supplies keep on giving an excellent price to performance ratio, and the 500W SFX-L model we’re looking at now is a prime example of that. It’s priced very reasonably, yet doesn’t cut any corners and comes with a couple of the nice-to-haves you would expect to pay a lot more for.
At 500W, it’s going to run most moderate builds today, but be careful with power-hungry components as they might need a bit more juice. The PSU comes with an 80+ Gold certification, which means you’ll get at least 90% efficiency under load. The fan inside is a 120mm model that runs silent and will slow down if it senses you aren’t pushing the PSU too much, which does help to keep system noise low.
To add to this, you’re looking at a fully modular design with flexible flat arrays cables. Cable management with the SilverStone will be absolutely no problem at all, and you’ll be able to set it up just right. Overall, if you want a good PSU that doesn’t compromise on any critical areas but don’t want to overpay for one, this is it.
Fractal Design ION SFX
Fractal Design is incredibly popular in the world of computer cases, and if you take a look at the ION SFX 650G, you’ll find that most of their clean lines and minimalist designs are translated here, too. It looks stunning, but you won’t be looking at it too much, so let’s discuss performance and functionality.
First of all, you can choose between a 500W and a 650W model, so you can get the one that’s right for the build you’re making, depending on how power-hungry the components you’re using are. Whichever you go for, you’re looking at an 80+ Gold efficiency, which means performance and reliability is great and heat emissions are greatly reduced. The 120mm fan inside helps keep things cool, yet is quiet and won’t make a lot of noise, even under load.
To add to this, you’re looking at a fully modular power supply which comes with Ultra-Flex cables that you can easily bend and twist to get just right. Cable management shouldn’t be a problem at all. All things considered, this is a very reliable power supply, and even though it’s priced somewhat higher than the competition, it’s more than worth it.
Seasonic Focus SGX-500
Those of you who know about Seasonic might know that they’re the OEM manufacturers for a lot of popular PSU brands, which means they know quite a bit when it comes to power supplies. Their Focus SGX-500 is a compact model that should work in most small form factor cases, and it comes at a reasonable price, so let’s take a closer look at it.
As the name implies, you’re looking at a 500W power supply, which should be enough to cover most entry-level or midrange builds you could be making. However, if you’ve got power-hungry components, make sure they’re okay with a 500W PSU. If you’re good on that front, you’ve got an 80+ Gold certification, so reliability and efficiency won’t be a problem at all.
In addition, this is a fully modular power supply, so you can only use the cables that you actually need. This helps quite a bit with cable management and is a welcome addition. Last but not least, you’re looking at a fan that works in three modes, depending on the requirements, but is overall as silent as possible. What more could you be asking for?
be quiet! BN638
Products by be quiet! have been rapidly rising in popularity in the past couple of years, as the brand has been making some really nice coolers, cases and power supplies. The BN638 is a prime example of SFX-L PSUs done right, and the fact that it comes at a decent price makes it an even sweeter deal.
This is a 500W power supply with an 80+ Gold certification, which means you’re covered both in terms of power, and efficiency. It’s also one of the more reliable PSUs you’ll come across and comes with a 3-year manufacturer warranty.
The 120mm fan is of high quality and is temperature-controlled, so you won’t have a loud PSU unless that’s really necessary. To add to this, this fully modular PSU comes with four PCIe connectors for multi-GPU support, as well as an SFX-to-ATX adapter bracket which lets you use it in a larger case, too. This only adds to its versatility and makes it perfect for a variety of scenarios. The only thing that could’ve been better is the price, but it’s far from unreasonable, and this is still a great deal.