SFX power supplies are compact power supplies made to fit in small form factor cases. While some small form factor cases allow for ATX power supplies, SFX power supplies are much more space-efficient and their cables are shorter allowing for better cable management.
SFX power supplies are highly recommended for Mini ITX cases and other compact cases. SFX power supplies can be as powerful and efficient as their ATX counterparts. Good SFX power supplies use high quality components and technology to provide clean voltages to power your components.
Depending on the SFX power supply, the dimensions vary. The types of SFX power supplies are Low Profile, Standard Profile, & PS3 Profile SFX power supplies. So what are the dimensions of SFX power supplies? – Low Profile SFX power supplies are: 100mm x 125mm x 50mm, Standard Profile are: 100mm x 125mm x 63.5mm, & PS3 profile are: 101.4mm x 150mm x 86mm.
All power supplies on this list are fully modular, you need fully modular power supplies when building an SFX system. It allows for you to cut down space which you need & it allows for better airflow.
5 Tips To Consider Before Purchasing A Power Supply
1. Don’t Assume Higher = More performance: Many assume that higher wattage power supplies are better for performance, this isn’t the case. You won’t need a 1600W Power supply unit for a system that only requires 600W.
2. Pay Attention To Efficiency Ratings: Look for higher efficiency power supplies as they use better components which results in the power supply generating less heat and consuming more energy.
3. Research The Brands: There are so many power supply brands out there, and not all of them produce great products. Reliable manufacturers are – Corsair, Seasonic, EVGA.
4. Know What Type Of PSU You Need: Do you need a modular or a non-modular power supply? Modular power supplies allow you to add and remove cables, none of them are soldered. Non-modular units come with all the necessary cables pre-attached, you cannot remove any of them.
5. Don’t mix and match cables: If your choice of power supply is fully modular, you’ll notice you can remove all the cables. While this is fine for cable management, you shouldn’t include cables that didn’t come with the PSU, this is why some power supplies fail and bring other components with them.
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If you’re in a hurry, here is a quick summary of the SFX Power supplies reviewed from budget to top tier for gaming.
Best 400-450W SFX Power Supply Units
The power supplies in this category go best if you’re building a low powered SFX system. Here you can find the right power supply to power your budget gaming build, you’ll most likely be gaming at around 1080P with these systems with a fairly low power-hungry graphics card.
1. Thermaltake Toughpower SFX 450W Gold
| Wattage | 450W |
| Efficiency Rating | 80+ GOLD |
| Length | 100MM |
| Modular | FULL |
| EPS Connectors | 1 |
| PCIe 6+2-Pin Connectors | 2 |
| SATA Connectors | 3 |
| Molex 4-Pin Connectors | 2 |
The ToughPower 450W Gold power supply is a great unit for low powered builds that doesnt require a lot of processing power. If you’re mainly browsing and doing professional work, then this power supply will not fail you.
450W however is still enough to power a CPU and a dedicated GPU as long as they’re not super power hungry. The power supply has great features such as zero RPM mode which switches the fan off to deliver a low noise experience.
It is also a fully modular power supply so you’re able to remove certain cables you will not be using. This is great for cable management and airflow. Also, this is advertised as having a single +12V rail for clean and stable voltages.
Why Should You Buy The Thermaltake Toughpower SFX 450W Gold
We recommend this power supply for beginner builders as it’s more likely that a beginner would use low-power components. So, if you’re building a PC with a particular power generous graphics card, this power supply could serve as an affordable option.
Additionally, it’s fully modular which is a massive benefit when building in a small case, any opportunity you have to save room is a massive benefit. So removing the unnecessary cables can increase airflow, and save space for extra components.
2. Corsair SF 450W
| Wattage | 450W |
| Efficiency Rating | 80+ Gold |
| Length | 100MM |
| Modular | FULL |
| EPS Connectors | 1 |
| PCIe 6+2-Pin Connectors | 2 |
| SATA Connectors | 4 |
| Molex 4-Pin Connectors | 4 |
When it comes to power supplies, you can count on Corsair. They provide super durable power supplies that’ll last a long time. The SF(Small Form Factor) 450 80+ Gold is a great durable unit with superb voltage regulation. They also utilize Japanese capacitors for increased durability.
When you’re building a small system, it’s important to have a high efficiency power supply for lower heat generation. The SF 450 80+ Gold provides up to 90% efficiency at 50% load on 115V circuits. Also, to keep things quiet. The SF 450 80+ Gold has zero RPM mode when the temperature is at a suitable level. This creates a low noise system.
This power supply is also fully modular which is an even bigger benefit when you go small. SFX cases can do with fewer cables in their system. Additionally, this unit uses a single +12V rail.
Why Should You Buy The Corsair SF 450W
Much like the Thermaltake SFX 450W gold power supply, this PSU serves as a low-powered option for builds that are not power-hungry. If you’re building a gaming PC with a low-powered GPU, or even a PC without a dedicated graphics card, this power supply is the best option.
You also enjoy the benefits of zero RPM mode which reduces the noise output of the power supply when the load isn’t particularly high, this is a benefit if you’re working and don’t want a noisy power supply distracting you.
3. EVGA SuperNOVA 450 GM
| Wattage | 450W |
| Efficiency Rating | 80+ Gold |
| Length | 100MM |
| Modular | FULL |
| EPS Connectors | 1 |
| PCIe 6+2-Pin Connectors | 2 |
| SATA Connectors | 4 |
| Molex 4-Pin Connectors | 4 |
The EVGA 450 GM is a fantastic fully modular power supply in one of EVGA’s most durable line of PSUs. It utilizes Japanese capacitors which are far more effective and durable than traditional capacitors. Your SFX build will benefit from this PSU since it’s durable & it’s fully modular; you’ll be able to remove cable clutter which benefits airflow.
Aucoustically, the fan blades are quiet and reliable thanks to the double ball bearing fan design. It gives the power supply a much longer life span thanks to its high reliability.
This unit is an 80+ unit which is what most gamers should be going for since they’re more reliable and they save you more money. The latest NVIDIA 3000 series graphics cards are going to be power hungry, so the massive +12V rail will ensure that each component is getting enough juice, up to 54.1A on the rail.
Why Should You Buy The EVGA SuperNOVA 450 GM
Here is another alternative low powered power supply, like previously stated, these power supplies ar perfect for low powered PC builds such as low-mid tier gaming PCs, and PCs that do not need a dedicated graphics card.
The EVGA SuperNOVA 450 is extremely durable, runs quietly, and has a 7-year warranty, this power supply is a great option for productivity builds for work, spreadsheets. If you’re building your first PC, this is a great option for you.
Best 500-550W SFX Power Supply Units
If your build is a little more powerful, perhaps you’re looking to play at 1440P+ with a decent graphics card, then these SFX power supplies are perfect for your mid-tier build.
4. SilverStone 550W SFX
| Wattage | 550W |
| Efficiency Rating | 80+ Gold |
| Length | 130MM |
| Modular | FULL |
| EPS Connectors | 1 |
| PCIe 6+2-Pin Connectors | 2 |
| SATA Connectors | 3 |
| Molex 4-Pin Connectors | 2 |
The SilverStone 550W SFX is a decent SFX power supply that runs fairly quiet. The 120MM fan is designed to operate quietly to enhancing whatever you’re doing with your system whether its gaming or standard browsing. The power supply is also 80+ Gold which means the power supply operates at high efficiency.
Moving onto the cables, the SilverStone 550W SFX is fully modular which is a massive benefit for SFX builds & the cables are flexible which essentially makes the cables more durable when they’re at extreme bends. Also, all the cables are made with flexible flat arrays.
For rails, the power supply uses a single +12V rail for clean voltages & they utilize Japanese capacitors for enhanced durability. The power supply is actually larger than most SFX power supplies coming in at 130MM, usually, they’re 100MM.
Why Should You Buy The SilverStone 550W SFX
The Silverstone 550W power supply unit is a great option for builds that require a bit more juice, mid-tier gaming PCs with a decent dedicated graphics card can run off such power supply which makes this an attractive option for SFX gamers. It is fully modular which means you can save space by removing cables.
5. EVGA SuperNOVA 550 GM2
| Wattage | 550W |
| Efficiency Rating | 80+ Gold |
| Length | 100MM |
| Modular | FULL |
| EPS Connectors | 1 |
| PCIe 6+2-Pin Connectors | 4 |
| SATA Connectors | 4 |
| Molex 4-Pin Connectors | 4 |
Another notable brand when it comes to power supplies is EVGA. EVGA are known for units such as the SuperNova G3 & G2 which are top tier power supplies. The GM2 550W is a premium SFX power supply which you can rely on, it only uses the highest quality components such as Japanese capacitors.
The EVGA GM2 550W is also fully modular which allows you to remove unnecessary cables that inhibit airflow. It uses a 92MM fan which has a special bearing that is both durable and acoustically pleasing.
Going over the Japanese capacitors again, EVGA uses 100% real Japanese capacitors, it is important that the capacitors are of high quality, they’re the most important component of a PSU.
The EVGA GM2 550W uses a single +12V rail which offers the best output when powering demanding components. It offers up to 54A on a single rail.
Why Should You Buy The EVGA SuperNOVA 550 GM2
The EVGA SuperNOVA 550W serves as a quiet, and extremely durable option for mid-tier builds, we say this because of the reputable brand and the use of Japanese capacitors. What this means, in the long run, is that you’ll have a long-lasting gaming PC that will operate quietly.
When you want to go the safe route which you should always go when buying a power supply, EVGA is often the first to mind for me. EVGA is known for its amazing units used among gamers and video editors. The EVGA SuperNOVA 550W GM2 is no different.
Best 600-650W SFX Power Supply Units
Here you’ll find power supplies that are best suited for mid-top tier builds. These units are able to handle the most powerful graphics cards and processors with some juice to spare.
6. Corsair SF600 SFX PSU 80 Plus Platinum
| Wattage | 600W |
| Efficiency Rating | 80+ Platinum |
| Length | 100MM |
| Modular | FULL |
| EPS Connectors | 1 |
| PCIe 6+2-Pin Connectors | 2 |
| SATA Connectors | 4 |
| Molex 4-Pin Connectors | 4 |
With all computer components, reliability is one of the most important factors, you don’t want your components breaking on you. Corsair is legendary in the PSU industry, most of their products are extremely durable so you can rely on them to last a long time. The SF600W power supply by Corsair includes Japanese capacitors which are far more durable than your traditional capacitors.
Efficiency rating is 80+ Platinum which in the long term can save you some money off your electricity bill. To be specific, you could save up to £3 a year compared to 80+ Gold modules. If you’re all about efficiency, then this PSU is amazing. The cables on the SF600W is fully modular & you’re able to remove unnecessary cables which potentially inhibit airflow.
Acoustically, the Corsair SF600 does quite well by allowing the fans to stop spinning once internal temperatures are low enough. This has two effects on the power supply and system overall, it reduces noise generated from the PC & it increases the durability of the fan.
Why Should You Buy The Corsair SF600 SFX PSU 80 Plus Platinum
The Corsair SF600 is a top-quality power supply that is used for mid-top tier gaming PCs which use moderately power-hungry graphics cards. If you’re building an SFX build which uses a graphics card such as the RTX 3070, then this power supply can support it quite easily.
Corsair is also a credible brand similar to EVGA, Corsair is also one of the top options when it comes to purchasing a power supply. The SF600 runs extremely efficiently as it’s rated as 80+ Platinum, and uses high-quality components, in the long run, the SF600 should save you money compared to an 80+ Gold unit.
7. SeaSonic Focus Gold SGX-650 SFX
| Wattage | 650W |
| Efficiency Rating | 80+ Gold |
| Length | 125mm |
| Modular | FULL |
| EPS Connectors | 1 |
| PCIe 6+2-Pin Connectors | 4 |
| SATA Connectors | 6 |
| Molex 4-Pin Connectors | 3 |
Seasonic is a power supply OEM(Original Equipment Manfucaturer), they provide brands such as Corsair with power supplies. Seasonic make some of the best power supplies, that’s why some Corsair power supplies are great, it’s because they’re made by Seasonic. Durability wise, it’s extremely durable with a 10 year warranty, you can expect your PSU to last well over 10 years.
In terms of size, it comes a little bit larger than most SFX power supplies, but it shouldn’t be too much of an issue. If you’re considering upgrading to an ATX build in the future, the power supply comes with an ATX adapter for increased compatibility.
Seasonic has a unique way of controlling the acoustics and temperature of the power supply. It uses what is called a Three-Phased thermal control which goal is to achieve a balance between silence and cooling. It has three stages – Fanless mode, Silent mode, and Cooling mode. Fanless mode means 0RPM, Silent mode limits the fan to a certain RPM, and cooling mode uses the full potential.
Why Should You Buy The SeaSonic Focus Gold SGX-650 SFX
Seasonic is a bit different as a brand compared to EVGA or Corsair, this is because Seasonic is an OEM which means they supply some brands with the best power supplies. There’s a chance your favorite power supply was manufactured by Seasonic, so Seasonic has quite the reputation.
The Seasonic Focus Gold 650 SFX carries the reputation of Seasonic being a high-quality unit that operates quietly and cool. It’s also a 650W unit which means it can support power-hungry components such as graphics cards and power-hungry CPUs. This is an amazing power supply for mid-top tier SFX builds for experienced builders.
Best 750-800W SFX Power Supply Units
A 750-800W SFX power supply is for PC building enthusiasts that want only the best in their builds. They’re most likely running multiple GPUs setups in their top-tier builds.
8. SilverStone 750W Titanium
| Wattage | 750W |
| Efficiency Rating | 80+ Titanium |
| Length | 130MM |
| Modular | FULL |
| EPS Connectors | 1 |
| PCIe 6+2-Pin Connectors | 4 |
| SATA Connectors | 12 |
| Molex 4-Pin Connectors | 3 |
Here is probably the most efficient power supply on the list. 80+ Titanium is even more efficient than platinum meaning you’ll save more money over time. The SilverStone 750W Titanium has everything you want in a top-tier power supply. It features flat cables which are even better for cable management and durability.
The power supply is a bit longer than the standard SFX units, but then again, it shouldn’t be an issue if you’re not going for an extremely compact build. The power supply uses all 100% Japanese capacitors which have more longevity over traditional capacitors.
If you’re going to be using demanding components then this power supply will have your back with its massive single +12 rail which allows up to 58A. This unit is also fully modular.
Why Should You Buy The SilverStone 750W Titanium
The SilverStone 750W Titanium is quite literally the most efficient SFX power supply in this list, Titanium power supplies are superior to platinum power supplies, so the Silverstone 750W will save you more money compared to the SF600.
750W is enough to power most graphics cards as long as you’re not running multiple graphics cards, this is quite unlikely with SFX builds anyways. So the SilverStone 750W Titanium is perfect for high-tier SFX builds with power-hungry graphics cards such as the RTX 3080.
9. Corsair SF750 Platinum
| Wattage | 750W |
| Efficiency Rating | 80+ Platinum |
| Length | 100MM |
| Modular | FULL |
| EPS Connectors | 1 |
| PCIe 6+2-Pin Connectors | 2 |
| SATA Connectors | 4 |
| Molex 4-Pin Connectors | 4 |
This is the exact same corsair power supply previously reviewed “Corsair SF600 SFX PSU 80 Plus Gold“, so it will have the same benefits. The Corsair SF750W is probably one of the best high-wattage SFX power supplies you can buy. It comes at a reasonable size, and it’s extremely efficient (80+ Platinum). You can expect lower temperatures, noise, and electricity bill.
It’s a common theme with SFX power supplies to be fully modular, it is expected since you gotta save space. The Corsair SF750W allows you to remove all cables for better airflow and easier cable management. Moreover, the cables are actually pretty durable since they’re sleeved even though it’s probably unnecessary. It may look aesthetically pleasing though.
The SF750 can be upgraded to an ATX power supply with a simple SFX to ATX bracket. If you ever plan on upgrading your system to ATX, then this will save you money by buying a new PSU. Additionally, the power supply has a 7-year warranty on it. Also, it features Zero RPM mode to lower noise and increase fan durability.
Why Should You Buy The Corsair SF750 Platinum
Slightly less efficient compared to the SilverStone 750w Titanium, the Corsair SF750 Platinum is an upgraded version of the SF600 being that it supports more wattage. So if you like the SF600 but need extra juice, this is the perfect PSU.
Also, it comes with the Zero RPM mode which can quiet the noise levels down by quite a bit, so if you’re playing a low load game or just browsing, the Zero RPM mode can make things more peaceful.
