Best SFX Power Supply

Get ready to power up your compact computer with the best SFX power supplies! The power supply is the heart of your computer, managing the power and providing energy to all parts, from the motherboard to the GPU. Gone are the days when heavy power supply units were the only option.

Today, compact SFX power supplies offer high performance for small form-factor builds. Whether you’re a gamer looking for a quiet and stylish machine, or just need a compact power supply for your desktop, SFX has you covered.

With shorter cables and efficient internal cable management, your system will look neat and organized. Upgrade to the best SFX power supply today and enjoy a compact, powerful computer!

Our Top 3 Recommendations

Best Pick Corsair SF750 Corsair SF750

7 year warranty.

Tight load regulation.

Most Popular EVGA SuperNOVA Series EVGA SuperNOVA Series

Highly efficient.

Reasonable and affordable price.

Operates very quietly.

Budget Pick SilverStone Technology SST-NJ450-SXL SilverStone Technology SST-NJ450-SXL

Protections work amazingly.

Flawless performance.

Best SFX Power Supply Summary

Image Model Price
Corsair SF750 Corsair SF750 See On Amazon
EVGA SuperNOVA Series EVGA SuperNOVA Series See On Amazon
SilverStone Technology SST-NJ450-SXL SilverStone Technology SST-NJ450-SXL See On Amazon
Seasonic Focus SGX-650 650W Seasonic Focus SGX-650 650W See On Amazon
FSP Dagger 550W Mini ITX FSP Dagger 550W Mini ITX See On Amazon
Corsair SF600 Platinum Corsair SF600 Platinum See On Amazon
XPG Core Reactor 650W XPG Core Reactor 650W See On Amazon
Corsair CX450 Corsair CX450 See On Amazon

Best SFX Power Supply At a Glance:

Best SFX Power Supply Reviews

Corsair SF750 (Image credit: Amazon)

Corsair SF750


7 year warranty.

Tight load regulation.


Pretty expensive.

Low hold-up time.

The Corsair SF750 Platinum is a top-performing SFX power supply that is unmatched in terms of power, efficiency, and quality. This premium unit is built with the best components and is designed to handle the power needs of high-end gaming systems and motherboards that require more power for the CPU.

With two EPS connectors, the Corsair SF750 Platinum is perfect for a powerful gaming setup.

It delivers excellent performance, with tight load regulation and excellent ripple suppression, making it one of the best in the industry. The semi-passive mode allows the unit to operate quietly under medium load, while still delivering up to 300W of power.

Under heavy load, the fan may reach up to 40dB(A), but it still offers superior performance compared to other SFX power supplies.

The SF750 Platinum comes with a seven-year warranty, making it a reliable and trustworthy choice for your gaming or high-end desktop computer. It is an excellent alternative to expensive graphics connectors, as it provides a single graphics card connector that is more cost-effective.

Corsair has set a high bar for SFX power supplies, making the SF750 Platinum a must-have for anyone looking for a compact, powerful, and efficient power supply unit.

EVGA SuperNOVA Series (Image credit: Amazon)

EVGA SuperNOVA Series


Highly efficient.

Reasonable and affordable price.

Operates very quietly.


High inrush current levels.

Presence of second EPS could've greatly enhanced the performance.

The EVGA SuperNOVA Series takes the second spot on our list of best SFX power supplies. Known for delivering top-notch hardware and software products, EVGA offers the perfect solution for desktop computer users.

The SuperNOVA 650 GM boasts a remarkable 650W power capacity, making it more powerful than most options at this price range.

The SuperNOVA 650 GM is certified 80 Plus Gold, ensuring it performs with an average efficiency of 90% to 92%. Its SFX form factor comes equipped with a 92mm double ball bearing fan to ensure optimal cooling.

The product is built with heavy-duty materials, providing a durable and reliable option. With a seven-year warranty period, the SuperNOVA 650 GM protects against any internal damage without added costs.

The device also has several safety measures in place to keep your computer secure, including OVP, OCP, OPP, SCP, and UVP.

The eco mode feature ensures a low noise operation with low to medium loads, making it an energy-efficient choice. Invest in the EVGA SuperNOVA Series for a high-performing and secure SFX power supply.

SilverStone Technology SST-NJ450-SXL (Image credit: Amazon)

SilverStone Technology SST-NJ450-SXL


Protections work amazingly.

Flawless performance.


Mounting the PSU may cause weaker chassis to bend or break.

Slightly pricey.

The SilverStone Technology SST-NJ450-SXL SFX Power Supply offers a unique, silent gaming experience with its fanless design. The unit is cooled by a heatsink that covers it, eliminating any sound from spinning fans that can be distracting to users.

The power connection ports are located on one side of the device and modular connectors on the other for attaching power cables.

Although innovative, the SST-NJ450-SXL has a limited capacity of 450 watts, making it suitable for limited use and not the best option for budget builds with newer graphics cards.

The high price tag of $229, however, makes it appealing to those seeking a silent gaming experience and who have the financial means to invest in a top-quality power supply.

In comparison to other options on the market, the SST-NJ450-SXL may not be the best choice for those looking for a higher output, but it certainly stands out as one of the most niche products in its category.

A true standout, the SST-NJ450-SXL is the perfect choice for those searching for the quietest SFX power supply on the market.

Seasonic Focus SGX-650 650W (Image credit: Amazon)

Seasonic Focus SGX-650 650W


Reasonably priced.

Provides a 10 year warranty.

Great build quality.


Fan switch is absent.

Supports only a single EPS connector.

The Seasonic Focus SGX-650 650W power supply is a remarkable mid-range option that provides ample power to meet the needs of most systems. Despite being a more affordable option, it boasts many of the same impressive features as its more premium counterparts.

Cooling is top-notch with the Focus SGX-650, thanks to its 120mm fan that is similar to the one found in SilverStone’s 800W SFX-L model. This, combined with its semi-passive design, not only ensures efficient cooling but also results in minimal noise emission.

Though it boasts a slightly lower efficiency rating of 80 Plus Gold, the Focus SGX-650 is still 87% efficient across a range of loads. Although it may not match the 800W SFX-L or SF750 in terms of efficiency, it more than compensates with its exceptional 10-year warranty, one of the best in the market.

In terms of features, the Focus SGX-650 has a lot to offer. Along with its strong warranty and sufficient power output, it also comes with a mounting bracket for ATX cases, providing versatility and ease of installation.

All in all, the Focus SGX-650 is a strong competitor in the SFX power supply market, offering a powerful and reliable solution for most users.

FSP Dagger 550W Mini ITX (Image credit: Amazon)

FSP Dagger 550W Mini ITX


High efficiency and good performance.

Fully modular.



Makes loud noise under load.

Designed and crafted by FSP, a brand dedicated to bringing customers top-quality power supplies that cater to their unique design requirements.

This Mini ITX power supply is not only petite in size but also boasts impressive storage capacity, making it a perfect fit for your small build. With 80+ Gold certification, the FPS Dagger 550W promises to save you money in the long run, thanks to its highly efficient AC to DC conversion process that generates minimal heat.

The power supply is equipped with an 80mm fan, providing silent operation and ensuring that your system stays cool and calm. Additionally, a surge protector has been added to offer an extra layer of protection against outages or surges in the power supply.

Choose the FPS Dagger 550W Mini ITX Power Supply for a powerful and secure solution that will help bring your compact build to life.

FSP’s commitment to providing top-notch power supplies for various designs makes the FPS Dagger 550W an excellent choice for users who prioritize performance, efficiency, and versatility.

Corsair SF600 Platinum (Image credit: Amazon)

Corsair SF600 Platinum


7 years warranty.

Solid and rigid build.

Fully modular.


Supports only a single EPS connector.

High inrush current levels.

Corsair is renowned as a leading manufacturer of high-quality PC components, delivering a diverse range of premium products from RAM modules to enthusiast-level PC cases.

The Corsair SF600 Platinum is a top-performing SFX power supply, rated for 600 watts of output power and certified 80+ Platinum for quiet and efficient operation.

With a fanless mode designed for silent operation, the SF600 Platinum is ideal for those looking to build a compact PC. The fully-integrated design features detachable, sleeved cables, making it easy to manage and modify your setup.

Additionally, the power supply is fully modular, allowing you to add or remove components as needed.

This SFX power supply stands out in its class, offering exceptional load regulation and ripple suppression, making it a top pick in the 550-600W range. With a seven-year warranty and an affordable price point, the Corsair SF600 Platinum is the best option for those looking for a high-quality and efficient SFX power supply.

For those on a tighter budget, a gold version of the SF600 is also available at a significantly lower cost compared to the platinum version.

XPG Core Reactor 650W (Image credit: Amazon)

XPG Core Reactor 650W


Alternate sleep mode compatible.

Modular design.


Connectors for EPS are on the same cable.

Heat-dissipating fan should be in center.

The XPG Core Reactor 650W is a top-performing SFX power supply that offers exceptional value for its price. With a maximum power rating of 650W, it surpasses the performance of similar power supplies such as the Corsair RM650x and Seasonic Focus Plus Gold.

Its relaxed fan profile and compact dimensions ensure quiet operation, making it ideal for use in a compact gaming setup.

Featuring a stylish design, this power supply unit is built to last with a CWT platform that is a close competitor to the Corsair RM650x. It is equipped to handle even the most power-hungry hardware, and its high efficiency means it operates silently and supports various sleep modes.

As a fully modular unit, the XPG Core Reactor 650W is easy to install and maintain, and it comes with a long-term warranty for added peace of mind.

This power supply unit offers excellent gaming performance and overall performance, making it a top choice for gamers and PC enthusiasts. While it may have a few minor drawbacks, such as its 3.3-volt transient response and the two EPS connectors being on the same cable, the XPG Core Reactor 650W offers incredible value for its price and is definitely worth considering.

Corsair CX450 (Image credit: Amazon)

Corsair CX450


Provides a complete set of protection features.

Great efficiency for a low-priced PSU.

Riffle bearing fan.


Connectors are close together.

Slightly noisy.

The Corsair CX450 SFX Power Supply is an excellent choice for budget-conscious gamers. With 80 Plus Bronze efficiency, this PSU can handle heavy loads with ease and provide long-lasting performance.

The sleek matte black finish and sleeved cable design add a touch of sophistication to your build, while the compact design makes it a great option for smaller form factor systems.

Although Corsair claims this power supply is silent, it may produce some noise under maximum load. However, this noise is manageable and not overly loud, making it a good option for those who are on a tight budget and not overly concerned with fan noise.

The unit only comes with one PCI-e connector, but this should not be a problem for most users who are building a system with a single graphics card.

Additionally, the Corsair CX450 comes with a 5-year warranty, providing peace of mind and protection for your investment. It is built to last, with sturdy construction and a reliable performance.

Whether you are a casual gamer or building a budget-friendly gaming PC, the Corsair CX450 SFX Power Supply is a great choice.

Quick Shopping Tips:

To choose the ideal unit within your budget, you should consider fundamental factors such as dimensions and supply type and each unit’s wattage rating, cable system, efficiency rating, etc. You’ll learn about the basic properties of SFX power supplies in this guide and find out what makes them ideal for casual use as well as heavy applications. After reading this, you can make an informed decision. Make sure you check out these factors carefully when you are shopping for a new SFX power supply:

Ratings of Wattage

To choose a suitable power supply for your system, it is essential to calculate how much output power it needs. To do that, you will have to calculate the requirements of every single component installed on the motherboard.

CPU, GPU, RAM, and other necessary components of a computer are included in this category. If you have a rough idea of the necessary power, you purchase a power supply with at least 30% to 40% more power to be safe. A power supply with a higher high power draw will have an unwanted effect on your computer and affect your electricity charges.

Certification of efficiency

Several certification programs verify power supply units. The most common is the 80-plus certification. As a result of this certification body, each unit can be rated according to one of the following categories: bronze, silver, gold, platinum, and titanium. In this range of power supply units, bronze-rated power supply units are the slowest, while the most efficient power supply units are suitable-rated power supply units.

If you buy a power supply with a low capacity, you should consider an 80-plus rating as it is a more reliable product. A bronze-rated power supply can be as high as 80 % efficient at 50% load, but a gold-rated power supply has an efficiency of around 96% under the same conditions.

The brand

When choosing a power supply, it is essential to consider the brand or designer of the power supply. The power rating of a product is usually higher than it is, so this product will need to be able to provide more power to your system.

Third-party and generic power supply units are most likely to have this problem. This problem can be prevented if you choose a PSU from a trustworthy brand that has already managed to serve many users worldwide. We have all the trusted brands available in the market so you will be OK with the compatibility of the SFX power supply.


The cables in your system are also essential since they carry the power from the power supply unit to the motherboard and many other components. Before deciding which SFX power supply suits you, consider this before purchasing. There is a need to check the cables carefully both before purchasing the unit as well as before installing the unit into the unit when the build is complete so that no issues will happen.


One of new computer builders' most common mistakes is choosing an incompatible power supply for their desktop system. It is possible to repair PC problems if the power supply unit develops a problem during installation. Once this is done, you can get the PC to run correctly. The disadvantage is that it can lead to severe problems such as overheating and noise issues in the future, so it is not recommended.

Additionally, if the power supply wattage for your system is incompatible with the power supply wattage for your system, you will also experience abnormal behavior on your system. We have ensured you can avoid these problems by providing you with some of the finest SFX power supply units capable of handling a wide range of applications perfectly.

I hope you find the one best suited to your system.

Frequently Asked Questions

Which SFX power supply is the most powerful?

SilverStone Technology’s 800W SFX-L power supply is the largest of the SFX power supplies available, but it is overkill for most users, and the price is high. SFX-L power supplies are the same width and height as regular SFX power supplies, so they can be fitted into the same cases as the regular SFX power supplies

How good are SFX PSUs?

The Corsair SF600 Platinum is one of the top SFX power supplies on the market for 550-600W. The SF600 Platinum is the best SFX power supply in the 550-600W category. There is no better power supply on the market. The SuperNOVA 550 GM is not only more expensive (about 50 to 60 percent higher than the SuperNOVA 550 GM), but it also has the best performance in its class.

SFX vs ATX power supplies: what's the difference?

The main reason you should choose an SFX power supply over an ATX power supply is that it has a smaller physical size than an ATX power supply. A growing number of small form factor PC cases simply do not have enough space to take advantage of an ATX power supply. SFX is the answer to this problem.

Asad Malik
Greetings, my name is Asad Malik, and I have done my intermediate in Computer Science, and I am very interested in keeping up to date with the latest tech products, buying them, and writing about them.