The Power supply is sometimes overlooked during the process of building a PC. However, it is arguably the most important component when building a gaming PC. A good power supply is efficient in terms of power consumption while fully supporting your desired components especially the graphics card. It should also produce lower heat, noise, and have the necessary protections to ensure that your system has a long lifespan. For that reason, we have put together a list of the best power supplies under $100. But first, let’s try to understand what factors to consider before buying a power supply.

What to look for when buying a power supply:

Choose Trusted Brands Over Generic Power Supplies

Brands such as EVGA, Corsair, and Thermaltake are prominent players in the power supply market so you can expect them to deliver a certain level of quality. On the other hand, generic power supplies are liable to be problematic in terms of performance and can adversely affect the lifespan of other components in your system.

Correct Power Rating

The power rating can be tricky at times to assess as simply reading it off the box is not enough. There are many factors at play such as the efficiency of the power supply. An important check is to ensure the +12 V line at least has 18 A of current. For normal usage, without any graphics cards, a wattage of 300w is sufficient.

80 Plus Efficiency Rating:

Multi Rails vs Single Rail

Multi rails and single rail power supplies have led to debate among the tech community. While some prefer the multi-rails due to their greater safety features in case of power outages and fluctuations, the rest lean towards single rail due to their greater power output. It all comes down to your usage and therefore, the decision should be made accordingly.

 Right Physical Features

It is best to list the connectors that your power supply should have by checking needs of the components in your computer build. Another important check is to see whether the PSU (Power Supply Unit) is ATX 12 V complaint. Along with the connectors, you should also factor in the size of the PSU to check whether it would fit in your rig’s casing. A power supply that is modular can also be beneficial.

Low Noise and Efficient

Low noise and power efficiency are 2 desirable features of power supplies. Look for PSU with large fans or temperature-controlled fans as they generally produce less noise. For power efficiency, look for 80plus certification logo on the box as it verifies that this PSU passed the necessary tests and would consume lower amount of power thus reducing electricity bills.

Best Power Supply under $100:

  1. CORSAIR TXM Series TX650M 650 Watt

CORSAIR TXM Series, TX650M, 650 Watt, 80+ Gold Certified, Semi Modular Power SupplyThe CORSAIR TXM Series TX650M is a great option for anyone interested in a top-notch power supply under a $100. With its ability to output full power at high ambient temperatures and its 80 Plus Gold rating, all of your power supply concerns would be put to rest. Additionally, it comes with a 120 mm rifle bearing fan that keeps noise to a minimum while the all Japanese capacitors promise to deliver reliability even with rising temperatures. In general, they have been well-liked for their performance but there has been some criticism regarding the thickness of its cables which makes it a bit of hassle to arrange properly within the casing.

CORSAIR TX Series TX750M Specifications:
Efficiency Certification Rating80 PLUS GOLD
TypeATX12V v2.4 / EPS 2.92
+12V RailsSingle
Maximum Power650W
Dimensions3.39″ x 5.91″ x 5.51″
Warranty7 years
ModularYes, Semi-Modular
Connectors1 x 24-pin ATX, 1 x EPS Connector, 1 x Floppy Connector, 4 x 4-Pin Peripheral Connector, 4 x PCIe Connector, 6 x SATA Connector
ProtectionsOVP (Over Voltage Protection), UVP (Under Voltage Protection), OPP (Over Power Protection), SCP (Short Circuit Protection), and OTP (Over Temperature Protection)

  1. EVGA 750 GQ

EVGA 750 GQ, 80+ GOLD 750W, Semi Modular, EVGA ECO Mode, 5 Year Warranty, Power Supply 210-GQ-0750-V1In the power supply market, EVGA 750 GQ is a viable option in the sub-100$ price range. The 80 Plus Gold rating promises to deliver highly efficient use of power. The 135 mm fluid dynamic fan aims to keep your PSU as cool as possible. Apart from these features, it comes with a host of protective measures such as OVP (Over-Voltage Protection) and SCP (Short Circuit Protection) to name a few that boost the life of the PSU and the rest of the components. It has been praised for its build quality and reliability even though there have been a few reports of the PSU dying out quite early.

EVGA 650 GQ Specifications:
Efficiency Certification Rating80 PLUS GOLD
TypeATX12V / EPS12V
+12V RailsSingle
Maximum Power750W
Dimensions3.35″ x 5.91″ x 6.50″
Warranty5 years
ModularYes, Semi-Modular
Connectors1 x 24-Pin ATX, 2 x 8-Pin (4+4) EPS (CPU), 6 x 8-Pin (6+2) PCI-E, 9 x SATA, 3 x Four-Pin Peripheral, 2 x Floppy
ProtectionsOVP (Over Voltage Protection), UVP (Under Voltage Protection), OCP (Over Current Protection), OPP (Over Power Protection), SCP (Short Circuit Protection), and OTP (Over Temperature Protection)
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  1. SeaSonic SSR-650RM

Seasonic G Series 650 SSR-650RM 650W 80+ Gold ATX12V & EPS12V Semi-Modular SLI Ready CrossFire Ready  105 °C Japanese Capacitor 5 Year Warranty Power SupplyWith so many subpar PSUs available, the SeaSonic SSR-650RM definitely is an outlier to that trend. It comes with ATX 12V compliance so there won’t be any issues with regards to compatibility with your motherboard. Like any good PSU, it also comes with 80 Plus Gold certification which means the PSU will utilize the power properly and reduce wastage through losses. The price to performance ratio has been a key selling point for this PSU but this comes at the price of reliability issues.

SeaSonic SSR-650RM Specifications:
Efficiency Certification Rating80 PLUS GOLD
TypeATX12V / EPS12V
+12V RailsSingle
Maximum Power650W
Dimensions3.39″ x 5.91″ x 6.30″
Warranty5 years
ModularYes
Connectors1 x 20+4pin Main Connector, 1 x 8/4pin CPU, 4 x 6+2pin PCI-E, 5 x Peripheral, 8 x SATA, 2 x Floppy
ProtectionsOVP (Over Voltage Protection), UVP (Under Voltage Protection), OCP (Over Current Protection), OPP (Over Power Protection), SCP (Short Circuit Protection), and OTP (Over Temperature Protection)
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  1. Seasonic FOCUS 450 Gold

Anyone who’s built a few computers has heard of Seasonic – they not only make their own power supplies but make a few for other popular brands. Their FOCUS 450 Gold is meant for people who want a very high-quality power supply, yet don’t need all that much power.

At 450 watts, the FOCUS isn’t too likely to power more than a mid-range to budget-oriented build. However, the 80+ Gold rating indicates that it is 87% efficient, which is excellent. The semi-modular design allows you to remove most of the unnecessary cables for less clutter in your case.

Other features include their excellent 120mm fluid dynamic bearing fan, which is quiet yet keeps the PSU low. There’s also fan control that optimizes how fast the fan runs, depending on the current load. You may think the 120mm fan is a bit too little, but the entire PSU is 140mm deep, so it’s pretty much the largest that fits.

Seasonic FOCUS Specifications:
Efficiency Certification Rating80 PLUS GOLD
TypeATX12V / EPS12V
+12V RailsSingle
Maximum Power450W
Dimensions86mm x 150mm x 140mm
Warranty7 years
ModularYes Semi
Connectors1x 20+4pin, 1x CPU, 4x PCIe, 8x SATA, 3x Peripheral, 1x Floppy
ProtectionsOVP (Over Voltage Protection), UVP (Under Voltage Protection), OCP (Over Current Protection), OPP (Over Power Protection), SCP (Short Circuit Protection), and OTP (Over Temperature Protection)
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  1. EVGA 550 B3

EVGA 550 B3, 80+ Bronze 550W, Fully Modular, EVGA ECO Mode, 5 Year Warranty, Compact 150mm Size, Power Supply 220-B3-0550-V1The EVGA 550 B3 is a great shout when it comes to picking a quality PSU. With the EVGA ECO intelligent thermal control system, fan noise is nearly non-existent at low to medium levels of stress. The hallmark of any good PSU, the 80 Plus certification, is also present in its Bronze variant. Furthermore, it also comes with a 130 mm long-life sleeve bearing that maintains low temperatures even when under load. This PSU has been considered to be quite stylish in terms of looks. However, some have disliked the increase in noise levels during power-intensive activities such as gaming.

EVGA 550 B3 Specifications:
Efficiency Certification Rating80 PLUS BRONZE
TypeATX12V / EPS12V
+12V RailsSingle
Maximum Power550W
Dimensions3.35″ x 5.90″ x 5.90″
Warranty5 years
ModularYes
Connectors1 x power 24 pin ATX, 1 x power 8 pin EPS12V, 2 x 8 pin PCI Express, 3 x 4 pin internal power, 6 x 15 pin Serial ATA power, 1 x 4 pin mini-power connector
ProtectionsOVP (Over Voltage Protection), UVP (Under Voltage Protection), OCP (Over Current Protection), OPP (Over Power Protection), SCP (Short Circuit Protection), and OTP (Over Temperature Protection)
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  1. Corsair VS600

Corsair CP-9020119-NA VS Series, VS600, 600 Watt (600W), Active PFC, 80 Plus White Certified Power SupplyCorsair continues its strong presence in the PSU market with the VS 600.  It comes with active power factor correction (PFC) that minimizes power losses. To maintain durability and longevity, it has been designed to reach max power output at 40 °C and comes with a wide array of protective measures like OVP and SCP.  It also comes with 120 mm thermally controlled fan which produces lesser noise. Another handy feature of VS 600 is that its ATX 12 V is backward compatible with older systems as well. It is considered by many as a viable cost-effective offering from a good brand but there are a few who have faced over-heating issues.

Corsair VS600 Specifications:
Efficiency Certification Rating80 PLUS WHITE
TypeATX12V v2.31 / EPS 2.92
+12V RailsSingle
Maximum Power600W
Dimensions3.39″ x 5.91″ x 5.51″
Warranty3 years
ModularNo
Connectors1 x ATX Connector, 1 x EPS Connector, 2 x Four Pin Peripheral Connector, 2 x PCIe Connector, 7 x SATA Connector, 1 x Floppy Connector
ProtectionsOVP (Over Voltage Protection), UVP (Under Voltage Protection), OPP (Over Power Protection), SCP (Short Circuit Protection), and OTP (Over Temperature Protection)
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  1. Thermaltake Smart DPS G 700W

Thermaltake Smart DPS G 700W Digital 80+ Bronze Semi-Modular ATX 12V 2.31/EPS 12V 2.92 Power Supply 7 YR Warranty PS-SPG-0700DPCBUS-BAmong the vast array of PSUs, the Thermaltake Smart DPS G 700W definitely stands out. It offers an 80 Plus Bronze rating that suggests that it would experience relatively fewer power losses compared to the average PSU. The unique feature of this PSU is that it comes with the DPS G App that allows you to manage your PSU via software. Other than that features such as single +12V rail design and high-quality Japanese capacitors aim to improve the performance and durability of the PSU. The quiet operation of this PSU has been widely praised but some have found the app tedious to use.

Thermaltake Smart DPS G 700W Specifications:
Efficiency Certification Rating80 PLUS BRONZE
TypeATX 12V 2.31 & SSI EPS 12V 2.92
+12V RailsSingle
Maximum Power700W
Dimensions3.38″ x 5.51″ x 5.90″
Warranty5 years
ModularYes
Connectors1x 24-pin ATX, 1x 4+4pin EPS, 4x 6+2 PCI-E, 8x SATA, 3x Peripheral, 1x Floppy, 1x USB
ProtectionsOVP (Over Voltage Protection), UVP (Under Voltage Protection), OCP (Over Current Protection), OPP (Over Power Protection), SCP (Short Circuit Protection), and OTP (Over Temperature Protection)
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