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Power Supplies under $100

All Power Supplies

7 power supplies under $100 from Rosewill, Thermaltake, MSI and more. Most cost $45 to $78, and half cost less than $62.

All filtersFilters (1)×
Efficiency: Bronze  ×Clear all
BrandMSI2SilverStone2ASRock1Evounic1Rosewill1
Watts650530014501
EfficiencyGold16Bronze7Platinum2
FormATX4SFX2
ModularNon-modular2Semi-modular2
ATX versionATX 3.12
12V-2x6 GPU power12V-2x6 GPU power1
PriceUnder $503Under $755Under $1504$50 & above4$75 & above2
Clear allShow 7 Power Supplies
Efficiency: Bronze  ×7 resultsSort byRecommendedSpec scorePrice: low to highPrice: high to low
RosewillSpec score 7.8

650 Watts, Bronze, ATX, Semi-modular

−Bronze: 18 of the 25 here have a higher efficiency
$49.96-17%List: $59.99
as of 11/04/2026 07:06 PST - Details
MSISpec score 7.8

650 Watts, Bronze, Non-modular

+650W output suits mid-range gaming builds
+Compact design fits smaller cases
+Low-noise fan for quieter operation
−Non-modular design means all cables stay attached
$61.99-5%List: $64.99
as of 11/04/2026 00:18 PST - Details
SilverStoneSpec score 7.5

300 Watts, Bronze, SFX

−300 watts: 28 of the 30 here have more watts
$78.99
as of 11/04/2026 07:08 PST - Details
MSISpec score 7.8

650 Watts, Bronze, ATX, Semi-modular

+650W output suits mid-range gaming builds
+Semi-modular design for partially detachable cables
+Compact ATX design fits smaller cases
$74.99
as of 11/04/2026 00:18 PST - Details
ASRockSpec score 7.8

650 Watts, Bronze, ATX, ATX 3.1

+650W output suits mid-range builds
+80 Plus Bronze certified efficiency
+ATX 3.1 ready for newer hardware
−Not fully modular, so cable management is more limited
$44.99
as of 11/04/2026 12:09 PST - Details
EvounicSpec score 7.8

650 Watts, Bronze, ATX, Non-modular

+650W output in a standard ATX form factor
+80 PLUS Bronze efficiency certification
+Non-modular design with fixed cables
−Non-modular design means cables cannot be removed
$39.96
as of 11/04/2026 14:09 PST - Details
SilverStoneSpec score 7.6

450 Watts, Bronze, SFX

+Compact SFX form factor suits small form factor builds
+450W output for light to mid-range compact systems
+80 Plus Bronze rated for efficiency
−SFX size may not fit standard ATX cases without an adapter
$90.84
as of 11/04/2026 07:08 PST - Details

Compare specs

power supplyWattsEfficiencyFormModularATX versionSpec scorePrice
650BronzeATXSemi-modularATX 3.17.8$49.96
as of 11/04/2026 07:06 PST - Details
650BronzeNon-modular7.8$61.99
as of 11/04/2026 00:18 PST - Details
300BronzeSFX7.5$78.99
as of 11/04/2026 07:08 PST - Details
650BronzeATXSemi-modular7.8$74.99
as of 11/04/2026 00:18 PST - Details
650BronzeATXATX 3.17.8$44.99
as of 11/04/2026 12:09 PST - Details
650BronzeATXNon-modular7.8$39.96
as of 11/04/2026 14:09 PST - Details
450BronzeSFX7.6$90.84
as of 11/04/2026 07:08 PST - Details

Before you buy

Other price ranges

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Popular filters

Fully Modular Power Supplies97ATX Power Supplies95ATX 3.1 Power Supplies88Power Supplies with 12V-2x6 GPU Power8580 Plus Gold Power Supplies76Power Supplies under $15068Power Supplies under $200651000W Power Supplies61

Power Supplies by use

Power Supply for a Gaming PC121

Related product types

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Spec scores, pros and cons, and prices are explained in the How it works section of the About page.