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 TX Series TX750M

CORSAIR TX Series TX750M 750W 80 PLUS Gold Modular Power SupplyThe CORSAIR TX Series TX750M is a great option for anyone interested in a top-notch power supply. 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 specs
Efficiency Certification Rating 80 PLUS GOLD
Type ATX12V v2.4 / EPS 2.92
+12V Rails Single
Maximum Power 750W
Dimensions 3.39″ x 5.91″ x 5.51″
Warranty 7 years
Modular Yes
Connectors 1 x 24-pin ATX, 1 x EPS Connector, 2 x Floppy Connector, 7 x 4-Pin Peripheral Connector, 4 x PCIe Connector, 8 x SATA Connector
Protections OVP (Over Voltage Protection), UVP (Under Voltage Protection), OPP (Over Power Protection), SCP (Short Circuit Protection), and OTP (Over Temperature Protection)

  1. EVGA 650 GQ

EVGA 650 GQ, 80+ GOLD 650W, Semi Modular, EVGA ECO Mode, 5 Year Warranty, Power Supply 210-GQ-0650-V1In the power supply market, EVGA 650 GQ is a viable option in the sub-100$ price range. The 80 Plus Gold rating promises to deliver a 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 specs
Efficiency Certification Rating 80 PLUS GOLD
Type ATX12V / EPS12V
+12V Rails Single
Maximum Power 650W
Dimensions 3.35″ x 5.91″ x 6.50″
Warranty 5 years
Modular Yes
Connectors 1 x 24-Pin ATX, 2 x 8-Pin (4+4) EPS (CPU), 4 x 8-Pin (6+2) PCIE, 9 x SATA, 3 x Four-Pin Peripheral, 2 x Floppy
Protections 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)
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  1. SeaSonic SSR-650RM

SeaSonic  650-Watt ATX12V/EPS12V SLI Ready CrossFire Ready 80 PLUS GOLD Certified Active PFC Power Supply SSR-650RMWith 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 specs
Efficiency Certification Rating 80 PLUS GOLD
Type ATX12V / EPS12V
+12V Rails Single
Maximum Power 650W
Dimensions 3.39″ x 5.91″ x 6.30″
Warranty 5 years
Modular Yes
Connectors 1 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
Protections 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)
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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 specs
Efficiency Certification Rating 80 PLUS BRONZE
Type ATX12V / EPS12V
+12V Rails Single
Maximum Power 550W
Dimensions 3.35″ x 5.90″ x 5.90″
Warranty 5 years
Modular Yes
Connectors 1 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
Protections 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)
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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 specs
Efficiency Certification Rating 80 PLUS BRONZE
Type ATX 12V 2.31 & SSI EPS 12V 2.92
+12V Rails Single
Maximum Power 700W
Dimensions 3.38″ x 5.51″ x 5.90″
Warranty 5 years
Modular Yes
Connectors 1x 24-pin ATX, 1x 4+4pin EPS, 4x 6+2 PCI-E, 8x SATA, 3x Peripheral, 1x Floppy, 1x USB
Protections 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)
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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 specs
Efficiency Certification Rating 80 PLUS WHITE
Type ATX12V v2.31 / EPS 2.92
+12V Rails Single
Maximum Power 600W
Dimensions 3.39″ x 5.91″ x 5.51″
Warranty 3 years
Modular No
Connectors 1 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
Protections OVP (Over Voltage Protection), UVP (Under Voltage Protection), OPP (Over Power Protection), SCP (Short Circuit Protection), and OTP (Over Temperature Protection)
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