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Best SFX Power Supplies 2021

Best SFX Power Supplies 2021 – A power supply, as the name suggests, is a crucial unit of every desktop system as it manages the power draw from the input and supplies the current to all parts of the computer such as the motherboard, RAM, CPU, GPU, and others.

Best SFX Power Supplies of 2021

Best SFX Power Supplies 2021 are one of the most compact forms of power supply units available for desktop cabinets that allow you to build a powerful desktop computer within a compact cabinet.

These power supplies are highly popular amongst gamers who want a silent and compact machine on their desks. It also comes with shorter cables that make the internal cable management much more efficient.

If you are looking for a new SFX power supply, make sure you check out the following factors carefully

What is a Power Supply?

A power supply is an electrical device that supplies electric power to an electrical load. The primary function of a power supply is to convert electric current from a source to the correct voltage, current, and frequency to power the load.

As a result, power supplies are sometimes referred to as electric power converters.

Factors To Consider

If you are looking for a new SFX power supply, make sure you check out the following factors carefully:

Wattage: As the power supply can only provide the rated power to the system, you need to figure out exactly how much power you will be needing to power your components. It is always beneficial to have at least 100 watts of extra power on the power supply for future upgrades.

Efficiency: The efficiency of the power supply also plays an important role in the overall usage of the desktop computer. The power supplies convert AC power into DC and work at a certain efficiency. The efficiency of a unit is suggested in terms of bronze, silver, gold, platinum, and titanium from the 80 plus certification program.

Form Factor: There are mainly 3 form factors available for power supplies that are ATX, SFX, and SFX-L. Out of these, the SFX form factor is perfectly suitable for smaller cabinets such as Mini ITX. You should always make sure that the form factor of your PSU is compatible with your cabinet and vice versa.

Top Picks for the Best SFX Power Supplies 2021

If your case has lots of room behind the motherboard, or your chassis doesn’t have a window or glass side, you can of course cable-wrap the wires you don’t need and stash them inside your rig.

But if the system you’re building doesn’t have space for this, or there’s no easy place to hide your cable mess, it’s worth paying extra for a modular power supply. Modular PSUs let you only plug in the power cables you need and leave the rest in the box.

To help you with your purchase, we will also provide you with a dedicated buying guide for SFX power supplies.

Best Cheap PSU

Corsair CX450

Manufacturer (OEM): Channel Well Technology or Great Wall | Max. DC Output: 450W | Efficiency: 80 PLUS Bronze | Form Factor: ATX12V v2.4, EPS 2.92 | Cooling: 120mm rifle bearing fan (HA1225M12F-Z or D12SM-12 ) | Modular: No | Warranty: 5 years

Corsair’s budget-oriented CX450 is unique in that it’s manufactured by two different OEMs–Great Wall and Channel Well Technology (CWT)–each of which uses a distinct platform.

The only way to tell them apart is by their RPS numbers, reference designators given to each model. Both configurations share the CX450’s principal weakness: fixed cables. However, they both utilize modern platforms featuring LLC resonant converters and voltage regulation modules, along with high-quality fans.

Corsair’s CX450 isn’t the cheapest name-brand 450W power supply out there. Although the 450 BT is a solid option, it’s based on an outdated platform, comes equipped with a lower-quality sleeve bearing fan and includes a three-year warranty. Meanwhile, Corsair covers the CX450 with five years of protection.

It’s worth spending the extra money for a more modern design and extra warranty coverage.



Best PSU: Up to 550 Watts

Corsair RM550x

Manufacturer (OEM): CWT | Max. DC Output: 550W | Efficiency: Form Factor: ATX12V v2.4, EPS 2.92 | Cooling: 135mm Rifle Bearing Fan (NR135L) | Modular: Yes | Warranty: 10 years

The updated PSU has been tweaked on its audibility front with a Zero RPM Fan Mode, which means at low and medium loads the cooling fan switches off entirely for near-silent and passive operation.

This 80 Plus Gold certified power supply has silent Zero-RPM fan operation. The product comes with solid capacitors and fully modular cables.

The PSU is cooled with a 140 mm fluid-dynamic-bearing fan that will only spin up when the PSU needs to and operating virtually silently at low and medium loads.

The silent RMx series is offered in five models, the RM550x, RM650x, RM750x, RM850x (all 16cm in length) and A 180mm-long casing for the RM1000x.




Best PSU: Up to 650 Watts

XPG Core Reactor 650W

Manufacturer (OEM): CWT | Max. DC Output: 650W | Efficiency: 80 PLUS Gold, ETA-A (88-91%) | Form Factor: ATX12V v2.52, EPS 2.92 | Cooling: 120mm Fluid Dynamic Bearing Fan (HA1225H12F-Z) | Modular: Fully | Warranty: 10 years

XPG is a popular sub-brand of ADATA that deals in various computer peripheral and storage devices.

Under this entity, ADATA mainly focused its efforts on PC Components, Solid State Drive, Memory Modules, gaming Notebooks, in short, high-end gaming products. Of course, to enrich the product line of the brand XPG also has products such as a keyboard, mouse, chassis, power supplies, and radiators, and heat sink.

Thus, XPG is not a stranger when it comes to gaming and PC storage products. However, the story doesn’t end here, one more product line of the brand through which the company is aiming for the PSU market is its CORE REACTOR series.




Best PSU: Up to 750 Watts

Corsair RM750x

Manufacturer (OEM): CWT | Max. DC Output: 750W | Efficiency: 80 PLUS Gold, ETA-A | Form Factor: ATX12V v2.4, EPS 2.92 | Cooling: 135mm Rifle Bearing Fan (NR135L) | Modular: Fully modular | Warranty: 10 years

How is it different from the rest of the power supply? We start with its 80 PLUS GOLD efficiency features that guarantee excellent durability, 7-year warranty) and premium Japanese components.

The core is manufactured by the prestigious CWT brand and is 100% compatible with Intel Haswell-E (LGA 2011-3), Skylake (LGA 1151) and earlier platforms.

It incorporates a single 62.5A rail that will provide a total of 750 watts real.

The cooling In the upper area we find the well-known ultra-silent 135 mm fan, to be exact it is the self-regulating (PWM) model NR135P and with semi-fan less technology that allows the fan to be stopped under load and only activated when the temperature rises to 50ºC.



Best PSU: Up to 850 Watts

Corsair AX850

(EC)Manufacturer (OEM): Seasonic | Max. DC Output: 850W | Efficiency: Form Factor: ATX12V v2.4, EPS 2.92 | Cooling: 135mm Fluid Dynamic Bearing Fan (HA13525L12F-Z) | Modular: Fully modular | Warranty: 10 years

The front part includes a notice (which we can obviously remove) indicating that the fan stays off at low and moderate loads.

If we wish, we have a switch to be able to deactivate this semi-passive mode and always make the fan work. (not pulsed = semi-passive, pulsed = fan always running)

As you might expect, the font is 100% modular.

Corsair includes the wiring in a very attractive bag as it is divided into compartments for each cable.

The brand has opted, as in the rest of its high-end PSUs, on meshed cables for the ATX, CPU and PCIe, and flat cables for the SATA and Molex strips. These cables are the universalized “Type 4” cables for which replacements and kits with sheath are sold separately.



Best PSU: Up to 1250 Watts

Corsair AX1000

Manufacturer (OEM): Seasonic | Max. DC Output: 1000W | Efficiency: 80 PLUS Titanium, ETA-A+ | Form Factor: ATX12V v2.4, EPS 2.92 | Cooling: 135mm fluid dynamic bearing fan (HA13525M12F-Z) | Modular: Fully modular | Warranty: 10 years

Once we have released the Corsair AX1000 from its packaging, we are faced with an ATX format power supply with dimensions of 150 x 86 x 170 mm (width, height, depth) and a fairly conventional design with a matte black chassis that is not the footprints remain.

Under its grille, we find a 135 mm fan with FDB bearings that remains off below 400W load (25º ambient temperature) making the source totally silent with the equipment at rest, although we can choose to turn off the Zero RPM system and rotate slowly under low load with the rear switch. Also here we find the usual C21 power connector and the on / off button.



Best PSU Above 1250-1500 Watts

Dark Power Pro 12 1500W

Manufacturer (OEM): CWT | Max. DC Output: 1500W | Efficiency: 80 PLUS Titanium, ETA-A+ | Form Factor: ATX12V v2.4, EPS 2.92 | Cooling: 135mm fluid dynamic bearing fan (BQ SIW3-13525-HF) | Modular: Fully modular | Warranty: 10 years

One of the keys to the great efficiency of these models is the fully digital configuration of the source where each component is perfectly tuned to offer great stability on each of the rails, including a DC-DC conversion design from the 12v rail.

To get other lower voltages such as 5 and 3.3 volts. The source is also designed entirely on a PCB bridge system, with no cabling, which improves stability, reduces wave spikes, and substantially improves the performance of a source with all modular cabling.

The source also includes a synchronous rectifier to improve the stability of the signal, both in light loads and taking advantage of the full potential of the power source.

This enables it for advanced configurations of high-consumption processors and also for new generations of graphics cards that, as you already know, have significantly increased their power requirements.



Best PSU Above 1500 Watts

Corsair AX1600i

Manufacturer (OEM): Flextronics | Max. DC Output: 1600W | Efficiency: 80 PLUS Titanium, ETA-A+ | Form Factor: ATX12V v2.4, EPS 2.92 | Cooling: 140mm Fluid Dynamic Bearing Fan (NR140P) | Modular: Fully modular | Warranty: 10 years

Let’s say you have a lot of money and you want to buy the best power supply available on the market.

So far that PSU has been the Corsair AX1500i, which, although it’s been in operation for several years now, has yet to be dethroned, achieving a higher overall performance score than any other PSU.

However, the performance gap with such major competitors as the mighty EVGA SuperNova 1600 T2 based on an excellent Super Flower platform has started to narrow, prompting Corsair to decide that it is time to introduce something even better, the AX1600i, which doesn’t.

It only performs better but is 100W more powerful, making it stand up to the SuperNova 1600 T2.

Priced at $ 450 (the AX1500i RRP is currently $ 50 less), the AX1600i is surely not a power supply that will sell in bulk, so one is right to ask why Corsair would spend So much time and money to create in the first place.



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