Best SFX PSU or Power Supply for Mini ITX and SFF Cases in 2019

If you are building a mini-ITX / SFX / SFF gaming PC or HTPC they you may require a SFX PSU or power supply. A SFX PSU is a small form factor power supply that is smaller than a regular ATX PSU. A regular SFX Power Supply is 100mm long (in depth), 125mm wide, 63mm tall {100mm (L) × 125 mm (W) × 63mm (H)}, while a standard ATX/PS2 power supply is 140mm long, 150mm wide and 86mm tall, but some ATX power supplies can be up to 200mm long especially the higher-end ones with more Wattage. SFX PSU, due to its much smaller dimensions, comes with smaller 80mm or 92mm fan.

A SFX PSU is generally used in small form factor PCs having mini-ITX or SFX low profile cases. This is because mini-ITX and SFF / SFX cases have space constraints and some of them only require SFX or SFX-L power supplies. However, a SFX PSU can also used in larger or regular ATX cases using ATX bracket. There is not enough range of SPF PSUs available in the market but here I am going to provide you the list of best SFF power supplies or SFX PSUs with their specifications. These small form factor power supplies can used for your SFF Gaming PC, SFF Workstation or HTPC.

Read also:

Top SFX PSU for SFF Gaming Build or HTPC

Here are the best SFX or SFF PSUs that can be used in all the compact PC cases or SFF cases.

SilverStone 450W SFX PSU 80 Plus Bronze (ST45SF-V3)

This is a decent Silverstone SFX power supply from SilverStone Technology. SilverStone ST45SF-V3 is a 450 Watt SFX power supply has good build quality and is quite affordable too. This is a good SFX power supply for a mini-ITX or SFF gaming PC or an HTPC. It is an 80 Plus Bronze certified PSU and has efficiency of around 82% – 85%. On the back side you can find ON/OFF switch which can prove very handy sometimes.

SilverStone-Technology-450W-SFX-Form-Factor-80-PLUS-BRONZE-Power-Supply-ST45SF-V3This SFF power supply has got single 12V Rail that has maximum current of 36A current on it. It can support up to mid-range graphics cards from both Nvidia and AMD. The power supply comes with all sleeved cables and has got a 92mm fan for cooling. The performance of the fan is quite good but it is not so silent, so HTPC users may not like it. Also the power supply comes with one 6-pin PCI Express power connector for graphics card and SFX to ATX Bracket for use in regular ATX cases. Overall it is a good SFX PSU that supports both ATX and Mini-ITX motherboards and it comes at a great price too.

SilverStone 450W SFX Power Supply (V3.0) Specifications
Wattage 450W
12V Rail 36 Ampere (Single Rail)
Fan Size 92mm
80 Plus Certification Bronze
PCI Express Connector 6 Pin x 1
Warranty 3 years

Buy Silverstone SFX 450W Power Supply

Corsair SF600 SFX PSU 80 Plus Gold

Corsair SF600 is one of the best branded SFX power supplies that you can buy for mini-ITX or SFF build whether it is a gaming PC or a silent HTPC. This is a power 600 Watt fully modular power supply that can be used in high-end SFF gaming build equipped with mid to high-end graphics card.

Corsair-SF600-SFX-PSU

The power comes with single 12V Rail having 50A current on it. The modular cables are soft, flexible and easier to work with. Corsair SF600 has got 80 Plus Gold Certification and you can expect 90% or more efficiency at 50% load. It comes with a super silent 92mm that has Zero RPM Fan Mode. This means the fan does not spin when the load on the PSU is low. For graphics cards it comes with two 8pin (6+2) PCI Express power connectors or cables. On the back of the SMPS you can find on / off switch. This power supply is compatible with both mini-ITX and ATX motherboards and cases.

Note: You can also find SFX power supply in 750W capacity too, as Corsair SF750 for much higher power requirements.

Corsair SF600 SFX Power Supply Specifications  
Wattage 600W
12V Rail 50A  (Single Rail)
Fan Size 92mm
80 Plus Certification Gold
PCI Express Connector 8pin (6+2) x 2
Warranty 7 years

Buy Corsair SF600 SFX Power Supply

Buy Corsair SF750 SFX Power Supply

Thermaltake Toughpower SFX 450W Gold

Thermaltake is a quite a big name in cooling solutions and power supplies. Here we have Thermaltake Toughpower SFX 450W Gold power supply which is a high-quality SFX PSU for small form factor computers. This is a fully modular 450W power supply and is 80 Plus Gold Certified for higher efficiency. The power supply is only 100mm in length which makes it fit in smallest of the cases.

Thermaltake-Toughpower-SFX-450W-Gold

It has got 37A current on its single 12V Rail which is enough for building a mid-range SFF gaming PC or a powerful HTPC. This SFX Power Supply from Thermaltake comes with a super silent 80mm Zero RPM Smart fan which will not spin when the load on the PSU is low. All the cables are braided and are quite strong. There are two 8-pin (6+2) PCI-E power connectors for graphics cards and the PSU comes with a SFX to ATX Adapter Bracket for use in normal ATX cabinets. There is also a 600W model available for this power supply for users who have higher power requirements with their SFX gaming build.

Thermaltake Toughpower SFX 450W Gold Specifications
Wattage 450W
12V Rail 37A, Single Rail
Fan Size 80mm
80 Plus Certification Gold
PCI Express Connector 8-pin (6+2)
Warranty 7 year

Buy Thermaltake Toughpower SFX 450W PSU

Buy Thermaltake Toughpower SFX 600W PSU

FSP Group 450 SFX PSU (80 Plus Bronze)

This is a decent budget SFX power supply from a lesser known brand which is FSP Group. This small form factor power supply has 80 Plus Bronze Certification and has maximum output of 450 Watts. It does lack on some quality as the cables are not sleeved or braided.

FSP-Group-FSP450-60GHS85-R-450W-SFX-PSU

It comes with dual 12V Rails with maximum of 36A current in total (18A + 18A). There is an 80mm fan which is a bit loud compared to other branded SFX power supplies from Corsair or Thermaltake. For graphics card it comes with 8-pin (6+2) and 6-pin PCI-E power connector which is enough to power a mid-range graphics card. On the back side you can find a ON/OFF switch and the PSU does come with SFX to ATX bracket so that it can be made fit in standard ATX cases or mini-ITX cases that support ATX PSUs. The exact model number for this sfx power supply is FSP450-60GHS(85)-R 450W.

FSP Group FSP450-60GHS(85)-R 450W SFX PSU Specifications
Wattage 450W
12V Rail 36A (18A + 18A), Dual Rails
Fan Size 80mm
80 Plus Certification Bronze
PCI Express Connector 8-pin (6+2), 6-pin
Warranty 3 year

Buy FSP Group 450 SFX PSU

Enermax Revolution SFX 550W 80 PLUS Gold PSU

Enermax may not be a well known brand or company but it does offer a very good SFX power supplies. Here we have Enermax Revolution SFX 550W power supply which is an 80 Plus Gold certified PSU and has efficiency of up to 92%.  It is a high quality fully modular power supply that comes with strong and sturdy flat cables and has 100 percent Japanese Capacitors.

Enermax-Revolution-SFX-550W-80-PLUS-Gold

This SFX power supply from Enermax has got single 12V rail with 46A current on it. It can power a powerful gaming PC with mid-range or high-end graphics card installed. For graphics card it comes with two 8pin (6+2) PCI Express power connectors. The power supply comes with an 80mm fan which is quite silent and works only when the load on the PSU is high. Also the PSU comes bundled with SFX to ATX adapter bracket for use in regular ATX cases. The various protection features in this power supply include OPP, OVP, UVP, OCP (+3.3V/+5V), OTP, SCP, and SIP. The exact model number of this SFX PSU is ERV550SWT. There is also a 650W model available of this SFX power supply for users who have higher power requirements. You can check both the models by going through the links given below.

Enermax Revolution SFX 550W Specifications
Wattage 550W
12V Rail 46A, Single
Fan Size 80mm
80 Plus Certification Gold
PCI Express Connector 8-pin (6+2) x 2
Warranty Check Seller

Buy Enermax Revolution SFX 550W PSU

Buy Enermax Revolution SFX 650W PSU

FSP Dagger 600W SFX PSU

A powerful SFX power supply from FSP that is meant for building a high-end mini-ITX gaming build or workstation. This is a 600 Watt SFX PSU that comes with single 12V rail and has 50A current on it. It a 4K / VR ready power supply and has got 80 Plus Gold certification rating and delivers at least 90% efficiency at typical load. This SFX compact power supply is fully modular and comes with ribbon cables that are easier to manage and gives neat and uncluttered look to the system.

FSP-Dagger-Gold-600W-SFX-PSU

FSP Dagger 600W Power Supply can handle high-end graphics cards without any issues and to power them it comes with two 8-pin (6+2) PCI-E cables. For cooling, it is fitted with an 80mm fan with dual ball bearing and it is quite silent in operation. Other features of this high-end SFX PSU include OCP/OVP/SCP/OPP/OCP/OTP protection, Active PFC, DC to DC module design and 100% Japanese capacitors. It comes bundled with an ATX bracket for use in PS2 ATX cases. It is also available in 500W variant and you can check both of them out by going to the link given below. Overall, a high-quality SFX power supply for powerful small form factor builds.

Note: This SFX PSU is also available in 500W variant as FSP Dagger 500W power supply.

FSP Dagger 600W SFX PSU Specifications
Wattage 600W
12V Rail 50A, Single
Fan Size 80mm, dual ball bearing
80 Plus Certification Gold
PCI Express Connector 8-pin (6+2) x 2
Warranty 3 years

Buy FSP Dagger 600W SFX PSU

Buy FSP Dagger 500W SFX PSU

EVGA SuperNOVA 650 GM SFX Power Supply

[Best SFX PSU for High-end Compact Builds]

EVGA, a reputed Nvidia graphics card and PSU manufacturer has introduced a new PSU series for Small Form Factor builds, which is EVGA SuperNOVA GM SFX Series. This SFX power supply series offer 450W, 550W and 650W PSUs that are fully modular in design, and comes with braided cables for extra protection. Also, all of them are 80 Plus Gold certified for better power efficiency and come with 92mm double ball bearing fan for durability and long life. The 92mm fan is very quiet in operation, and does not spin at low loads which makes the PSU completely silent during normal operation.

EVGA-SuperNOVA-650-GM-SFX-Power-Supply

Here we have EVGA SuperNOVA 650 GM SFX Power Supply which is the powerful PSU in this series and probably one of the best SFX Power Supplies that you can get for your SFF gaming PC or work PC. It comes with a single 12V Rail that has 54.1A current on it, which is enough to power a gaming PC with a powerful CPU and high-end graphics card like GeForce GTX 1080, GTX 1080 Ti etc. For graphics card, it has got four 8pin (6+2) connectors which are more than sufficient for any graphics card out in the market.

The build quality of the PSU is great and it comes with all the Heavy-duty protection features that include OVP (Over Voltage Protection), UVP (Under Voltage Protection), OCP (Over Current Protection), OPP (Over Power Protection), SCP (Short Circuit Protection), and OTP (Over Temperature Protection). Other features include Active Power Factor Correction (PFC) and 100% Japanese Capacitors. An SFX to ATX Bracket Adapter comes included with the PSU that allows it to use in standard ATX case too. So, if you are looking for a high quality and powerful SFX PSU for your high-end compact gaming build or workstation then grab it quickly without thinking too much.  

EVGA SuperNOVA 650 GM SFX PSU Specifications
Wattage 650W
12V Rail 54.1A, Single
Fan Size 92mm
80 Plus Certification Gold
PCI Express Connector 4x 8pin (6+2)
Warranty 7 years

Buy EVGA SuperNOVA 650 GM SFX Power Supply

Best SFX-L PSU for SFF & Slim PC Cases

SFX-L is a slightly larger form factor than regular SFX one. An SFX-L Power Supply is 30mm longer than a standard SFX Power Supply and comes with a 120mm fan that makes it quieter in operation and it also provides better cooling to the PSU components. The total length of SFX-L PSU is 130mm. Most of the slim and low-profile cases do support both SFX-L and SFX power supplies. Here are the best SFX-L PSUs for use in SFF and SFX cases.

SilverStone SX500-LG SFX-L PSU

SilverStone SX500-LG is fully modular SFX-L PSU for use in high performance small form factor computers. It comes with a single 12V rail with 40A current on it and is rated with 80 Plus Gold Certification. It has a silent 120mm fan with intelligent semi-fanless operation. It can easily support a mid to high-end graphics card and has got two 8 / 6-pin PCIe power connectors for it.

SilverStone-SX500-LG-SFX-L-PSU

It comes with ATX bracket for use in standard ATX PC cases. The cables are flat which makes them easier to manage and assemble in the case. It comes with all the necessary protection features that include Over Power Protection, Over Voltage Protection, Over Temperature Protection, Under voltage protection, Short Circuit Protection. If you need more power then it is also available in 700W variant as SilverStone SX700-LPT PSU, that comes with 58.4 current on 12V Rail. You can check both these SFX-L PSU models from the links below.   

SilverStone SX500-LG SFX-L PSU Specifications
Wattage 500W
12V Rail 40A, Single
Fan Size 120mm
80 Plus Certification Gold
Modular Yes, Fully Modular
PCI Express Connector 2 x 8 / 6-Pin PCIE connector
Warranty 3 year

Buy SilverStone SX500-LG SFX-L PSU

Buy SilverStone SX700-LPT SFX-L PSU

be quiet! SFX L Power 500W PSU

A high performance 500 Watt SFX-L power supply from be quiet!, which is a highly reputed brand and is known for its silent cases, CPU coolers and fans. It is an 80 Plus Gold PSU and comes with 41.74A of current on its single 12V Rail. It supports multi-GPU setup and comes with four (6+2)-pin PCI-E power connectors for graphics cards. The Temperature-controlled 120mm fan in this PSU has got sleeve bearing and is pretty silent in operation.

be-quiet-SFX-L-Power-500W-PSU

This is a fully modular SFX L power supply and comes with flat cables. Other features include Stable LLC, Synchronous Rectifier (SR), DC-to-DC power conversion, Active PFC (0.99), OCP (over current protection), OVP (over voltage protection), UVP (under voltage protection), SCP (short circuit protection), OTP (over temperature protection), OPP (over power protection). It comes bundled with SFX-to-ATX adapter for use in larger or standard sized ATX cases. The power supply is also available in 600W variant and you can check both these models from the links given below.

Be quiet! SFX L Power 500W PSU Specifications
Wattage 500W
12V Rail 41.7A, Single
Fan Size 120mm
80 Plus Certification Gold
Modular Yes, Fully Modular
PCI Express Connector 4 x (6+2) Pin PCIe connector
Warranty 3 year

Buy be quiet! SFX L Power 500W PSU

Seasonic Focus SGX-650 PSU

[High Quality & Great Performance]

A powerful and high-end 650W SFX-L power supply from Seasonic, which is a pioneer when it comes to power supplies. This is a fully modular PSU and is rated for 80-Plus gold Certification, and offers 90% efficiency at 50% system load. It has got single 12V rail that has 54A current on it, which is adequate even for a powerful gaming build. It comes with three 8-pin (6+2) PCI-Express connectors for graphics cards. This SFX-L power supply may seem compact, but is very powerful and can handle any high-end graphics card without any issues.

Seasonic-Focus-SGX-650-PSU

For cooling, it comes with a 120mm Fan with Fluid Dynamic Bearing (FDB) for longevity and silent operation. The Hybrid Silent Fan Control of this PSU operates in three modes: Fanless Mode, Silent Mode, and Cooling Mode. Up to 30% load, it operates in fanless mode (0dB noise), from 31% to 50%, it operates in silent mode, and above 50%, it operates in cool mode. The modular cables that come with this PSU are flat, which makes them tangle free and they somewhat create less clutter too. However, the cables are not braided . The power supply has got all the safety  and protection features inlcuding OPP, OVP, UVP, OCP, OTP, SCP. An SFX to ATX adapter is included with this power supply for use in regular ATX cases. So, if you are looking for powerful SFX-L PSU for your compact gaming build then just go for it.

Note: A 450W variant is also available for this PSU, which is Seasonic Focus SGX-450, having 37A current on its 12V Rail. You can check out it out too from the links given below.

Seasonic Focus SGX-450 450W PSU Specifications
Wattage 650W
12V Rail 54A, Single
Fan Size 120mm
80 Plus Certification Gold
Modular Full Modular
PCI Express Connector 3 x (8 / 6 Pins) PCIe connector
Warranty 10 years

Buy Seasonic Focus SGX-650 PSU

Buy Seasonic Focus SGX-450 PSU

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Final Words

At the end I would like that if you are building a SFX or SFF gaming PC or HTPC then these above mentioned SFX PSUs are great options to go with. All these small form factor power supplies are quite powerful, have good build quality and offers good performance. Also these SFX PSUs can be used in both SFF and regular ATX cases using the SFX to ATX Bracket. If you have any queries about power supplies. graphics cards or gaming build then you can ask me that by leaving a comment below.

6 Comments

  1. Konstantinos April 30, 2017
    • Akshat Verma May 1, 2017
  2. Iraj May 4, 2019
    • Akshat Verma May 4, 2019
      • Iraj May 4, 2019
      • Akshat Verma May 4, 2019

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