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.

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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 450W
Thermaltake Toughpower SFX 450W 80+ Gold Fully Modular SFX 12V 3.3/ATX 12V 2.4 Power Supply 7 YR Warranty PS-STP-0450FPCGUS-G
Best 550W
EVGA SuperNOVA 550 GM, 80 Plus Gold 550W, Fully Modular, ECO Mode with DBB Fan, 7 Year Warranty, Includes Power ON Self Tester, SFX Form Factor, Power Supply 123-GM-0550-Y1
Best 650W
Seasonic FOCUS SGX-650, 650W 80+ Gold, Full-Modular, SFX-L Form Factor, Compact Size, Fan Control in Fanless, Silent, and Cooling Mode, Power Supply, SSR-650SGX.
Best 750W
Corsair SF Series, SF750, 750 Watt, SFX, 80+ Platinum Certified, Fully Modular Power Supply
Thermaltake Toughpower SFX 450W 80+ Gold Fully Modular SFX 12V 3.3/ATX 12V 2.4 Power Supply 7 YR Warranty PS-STP-0450FPCGUS-G
EVGA SuperNOVA 550 GM, 80 Plus Gold 550W, Fully Modular, ECO Mode with DBB Fan, 7 Year Warranty, Includes Power ON Self Tester, SFX Form Factor, Power Supply 123-GM-0550-Y1
Seasonic FOCUS SGX-650, 650W 80+ Gold, Full-Modular, SFX-L Form Factor, Compact Size, Fan Control in Fanless, Silent, and Cooling Mode, Power Supply, SSR-650SGX.
Corsair SF Series, SF750, 750 Watt, SFX, 80+ Platinum Certified, Fully Modular Power Supply
Warranty
N/a
7
10
7
Prime Status
-
-
-
-
Star Rating
Best 450W
Thermaltake Toughpower SFX 450W 80+ Gold Fully Modular SFX 12V 3.3/ATX 12V 2.4 Power Supply 7 YR Warranty PS-STP-0450FPCGUS-G
Thermaltake Toughpower SFX 450W 80+ Gold Fully Modular SFX 12V 3.3/ATX 12V 2.4 Power Supply 7 YR Warranty PS-STP-0450FPCGUS-G
Warranty
N/a
Prime Status
-
Star Rating
Check Price
Best 550W
EVGA SuperNOVA 550 GM, 80 Plus Gold 550W, Fully Modular, ECO Mode with DBB Fan, 7 Year Warranty, Includes Power ON Self Tester, SFX Form Factor, Power Supply 123-GM-0550-Y1
EVGA SuperNOVA 550 GM, 80 Plus Gold 550W, Fully Modular, ECO Mode with DBB Fan, 7 Year Warranty, Includes Power ON Self Tester, SFX Form Factor, Power Supply 123-GM-0550-Y1
Warranty
7
Prime Status
-
Star Rating
Check Price
Best 650W
Seasonic FOCUS SGX-650, 650W 80+ Gold, Full-Modular, SFX-L Form Factor, Compact Size, Fan Control in Fanless, Silent, and Cooling Mode, Power Supply, SSR-650SGX.
Seasonic FOCUS SGX-650, 650W 80+ Gold, Full-Modular, SFX-L Form Factor, Compact Size, Fan Control in Fanless, Silent, and Cooling Mode, Power Supply, SSR-650SGX.
Warranty
10
Prime Status
-
Star Rating
Check Price
Best 750W
Corsair SF Series, SF750, 750 Watt, SFX, 80+ Platinum Certified, Fully Modular Power Supply
Corsair SF Series, SF750, 750 Watt, SFX, 80+ Platinum Certified, Fully Modular Power Supply
Warranty
7
Prime Status
-
Star Rating
Check Price

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

Wattage450W
Efficiency Rating80+ GOLD
Length100MM
ModularFULL
EPS Connectors1
PCIe 6+2-Pin Connectors2
SATA Connectors3
Molex 4-Pin Connectors2

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.

Pros
  • Great for beginner builders
  • Affordable
  • High quality
  • Zero RPM mode
Cons
  • Low wattage

2. Corsair SF 450W

Wattage450W
Efficiency Rating80+ Gold
Length100MM
ModularFULL
EPS Connectors1
PCIe 6+2-Pin Connectors2
SATA Connectors4
Molex 4-Pin Connectors4

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 for 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.

Pros
  • Reputable brand
  • High quality components
  • Zero RPM mode
  • Fully modular
Cons
  • Can get noisey

3. EVGA SuperNOVA 450 GM

Wattage450W
Efficiency Rating80+ Gold
Length100MM
ModularFULL
EPS Connectors1
PCIe 6+2-Pin Connectors2
SATA Connectors4
Molex 4-Pin Connectors4

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.

Pros
  • Decent sized +12V rail
  • Highly durable
  • Runs quiet
  • 7year warranty
Cons
  • Only good for low power consuming hardware

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

Wattage500W
Efficiency Rating80+ Gold
Length130MM
ModularFULL
EPS Connectors1
PCIe 6+2-Pin Connectors2
SATA Connectors3
Molex 4-Pin Connectors2

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.

Pros
  • Operates quietly
  • Flexible fully modular cables
  • Japanese capacitors
Cons
  • Slightly large

5. EVGA SuperNOVA 550 GM2

Wattage550W
Efficiency Rating80+ Gold
Length100MM
ModularFULL
EPS Connectors1
PCIe 6+2-Pin Connectors4
SATA Connectors4
Molex 4-Pin Connectors4

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 which 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.

Pros
  • Highly durable unit
  • Reputable brand
  • Japanese capacitors
  • Quiet operation
Cons

    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 Gold

    Wattage600W
    Efficiency Rating80+ Platinum
    Length100MM
    ModularFULL
    EPS Connectors1
    PCIe 6+2-Pin Connectors2
    SATA Connectors4
    Molex 4-Pin Connectors4

    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.

    Pros
    • Credible brand
    • Extremely efficient
    • Quiet operation
    • High quality components
    Cons
    • Slightly more expensive

    7. SeaSonic Focus Gold SGX-650 SFX

    Wattage650W
    Efficiency Rating80+ Gold
    Length125mm
    ModularFULL
    EPS Connectors1
    PCIe 6+2-Pin Connectors4
    SATA Connectors6
    Molex 4-Pin Connectors3

    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.

    Pros
    • Top-Tier OEM
    • Silent operation
    • Cool operation
    • High quality components
    Cons
    • Slightly larger

    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

    Wattage800W
    Efficiency Rating80+ Titanium
    Length130MM
    ModularFULL
    EPS Connectors1
    PCIe 6+2-Pin Connectors4
    SATA Connectors12
    Molex 4-Pin Connectors3

    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.

    Pros
    • Fully modular
    • Extremely efficient
    • High quality components
    • Runs cool & quiet
    Cons
    • Slightly larger

    9. Corsair SF750 Platinum

    Wattage750W
    Efficiency Rating80+ Platinum
    Length100MM
    ModularFULL
    EPS Connectors1
    PCIe 6+2-Pin Connectors2
    SATA Connectors4
    Molex 4-Pin Connectors4

    This is the exact same corsair power supply previously review “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 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.

    Pros
    • Best 750W SFX power supply
    • Sleeved fully modular cables
    • SFX to ATX bracket
    • Zero RPM mode
    Cons
    • Slightly pricey