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Power Supplies under $100

All Power Supplies

31 power supplies under $100 from Rosewill, Thermaltake, MSI and more. Most cost $40 to $94, and half cost less than $75.

Top brands: MSI (5)

PhanteksSpec score 9.5

1000 Watts, Platinum, ATX, Fully modular

+1000W output for high-power gaming systems
+Fully modular cable-less design
+16-pin GPU connector for newer graphics cards
$69.08-65%List: $199.99
as of 11/04/2026 00:38 PST - Details
MSISpec score 8.2

650 Watts, Gold, ATX, Non-modular

+650W output in a standard ATX form factor
+80 PLUS Gold efficiency certification
+Low noise operation
−Non-modular design means cables cannot be removed
$42.74-39%List: $69.99
as of 11/04/2026 00:18 PST - Details
be quiet!Spec score 9.3

750 Watts, Platinum, ATX, Fully modular

+Platinum: the highest efficiency of the 26 here
+Fully modular: only 13 of 32 here have one
$99.90-38%List: $159.90
as of 11/04/2026 13:06 PST - Details
ThermaltakeSpec score 8.3

750 Watts, Gold, ATX, ATX 3.1

+Gold: only 2 of 26 here have a higher efficiency
+750 watts: 17 of the 31 here have fewer watts
$74.99-25%List: $99.99
as of 11/04/2026 08:06 PST - Details
Rosewill

550 Watts, Non-modular

+550W output for mid-range builds
+Active PFC design for power factor correction
+Low-noise design for quieter operation
−Non-modular design means all cables are fixed
$35.98-22%List: $45.99
as of 11/04/2026 07:06 PST - Details
MSISpec score 9.1

750 Watts, Gold, ATX, Fully modular

+750W output suits mid-range to high-end builds
+Fully modular cabling reduces loose cables
+16-pin GPU connector included
$89.99-18%List: $109.99
as of 11/04/2026 00:18 PST - Details
RosewillSpec score 7.8

650 Watts, Bronze, ATX, Semi-modular

−Bronze: 19 of the 26 here have a higher efficiency
$49.96-17%List: $59.99
as of 11/04/2026 07:06 PST - Details
RosewillSpec score 8.2

650 Watts, Gold, ATX, Non-modular

+650W output for mid-range builds
+ATX 3.1 compatible for current PC standards
+Includes a 16-pin PCIe 5.1 GPU connector
−Non-modular design means all cables are fixed
$47.97-20%List: $59.99
as of 11/04/2026 07:06 PST - Details
ThermaltakeSpec score 8.1

600 Watts, Gold, ATX, Non-modular

+600W continuous output in a standard ATX form factor
+Supports SLI and Crossfire configurations
+Built to ATX 12V V2.4 and EPS V2.92 standards
−Non-modular design means all cables are permanently attached
$59.99-14%List: $69.99
as of 11/04/2026 08:06 PST - Details
RosewillSpec score 9.3

1000 Watts, Gold, ATX, Fully modular

+1000W output for high-end multi-GPU builds
+Fully modular cable design
+Includes 16-pin PCIe 5.1 12V-2x6 connector
$94.99-14%List: $109.99
as of 11/04/2026 07:06 PST - Details
Thermaltake

500 Watts, ATX

+500W output for mid-range builds
+ATX form factor fits standard cases
+120mm fan for cooling
$39.99-11%List: $44.99
as of 11/04/2026 08:06 PST - Details
MontechSpec score 9.1

750 Watts, Gold, ATX, Fully modular

+Gold: only 2 of 26 here have a higher efficiency
+Fully modular: only 13 of 32 here have one
$72.90-9%List: $79.90
as of 11/04/2026 00:16 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
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
SilverStoneSpec score 7.5

300 Watts, Bronze, SFX

−300 watts: 29 of the 31 here have more watts
$78.99
as of 11/04/2026 07:08 PST - Details
XPGSpec score 9.2

850 Watts, Gold, Fully modular, ATX 3.1

+850W output for high-end graphics cards
+Fully modular cable design
+ATX 3.1 compatible design
$89.99-25%List: $119.99
as of 11/04/2026 09:06 PST - Details
RaijintekSpec score 8.3

850 Watts, Gold, ATX, Non-modular

+850W output for mid-to-high power builds
+ATX 3.1 standard with PCIe 5.1 support
+16-pin connector for modern graphics cards
−Non-modular cabling leaves all cables permanently attached
$79.99
as of 11/04/2026 00:48 PST - Details
MSISpec score 8.2

650 Watts, Gold, ATX, Non-modular

+650W output suits mid-range builds
+ATX 3.1 standard for current PC builds
+Active PFC listed
−Non-modular cabling leaves all cables permanently attached
$59.99
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 11/03/2026 22:54 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
Generic

220 Watts

+Rated at 220W for compact systems
+Compatible with 504965-001 and 504966-001 parts
+Listed for pc8044 and pc8046 models
−Lower 220W output limits high-power components
$78.82
as of 11/04/2026 11:10 PST - Details
Esgaming

650 Watts, ATX, Non-modular

+650 watts for mid-range builds
+Includes 120mm fan for cooling
+Switchable 115/230 voltage input
−Non-modular cabling leaves unused cables inside the case
$34.96
as of 11/03/2026 22:52 PST - Details
EnermaxSpec score 9.2

850 Watts, Gold, ATX, Fully modular

+Fully modular cabling for cleaner builds
+Includes 16-pin GPU connector for modern graphics cards
+ATX 3.1 standard for current PC builds
$95.49
as of 11/03/2026 22:50 PST - Details
GIGABYTESpec score 9.2

850 Watts, Gold, ATX, Fully modular

+Fully modular design reduces loose cables inside the case
+850W output for mid to high-end builds
+ATX form factor fits standard PC cases
$89.99
as of 11/03/2026 23:11 PST - Details
RosewillSpec score 9.2

850 Watts, Gold, ATX, Fully modular

+850W output for high-power gaming and workstation builds
+Fully modular cable design
+Includes 16-pin PCIe 5.0 12V-2x6 connector
$98.90
as of 11/04/2026 07:06 PST - Details
GamemaxSpec score 9.1

750 Watts, Gold, ATX, Fully modular

+750W output suits high-performance mid-range builds
+Fully modular cables reduce clutter inside the case
+Includes a 16-pin GPU connector
$76.99
as of 11/03/2026 23:06 PST - Details
EsgamingSpec score 8.9

500 Watts, Gold, Fully modular

+Delivers 500 watts in an ITX, 1U and Flex ATX form factor
+Fully modular cables reduce clutter in small cases
+Supports 90-264V input range with APFC
$49.98
as of 11/03/2026 22:52 PST - Details

Compare specs

power supplyWattsEfficiencyFormModularATX versionSpec scorePrice
1000PlatinumATXFully modularATX 3.09.5$69.08
as of 11/04/2026 00:38 PST - Details
650GoldATXNon-modular8.2$42.74
as of 11/04/2026 00:18 PST - Details
750PlatinumATXFully modularATX 3.19.3$99.90
as of 11/04/2026 13:06 PST - Details
750GoldATXATX 3.18.3$74.99
as of 11/04/2026 08:06 PST - Details
550Non-modularn/a$35.98
as of 11/04/2026 07:06 PST - Details
750GoldATXFully modularATX 3.19.1$89.99
as of 11/04/2026 00:18 PST - Details
650BronzeATXSemi-modularATX 3.17.8$49.96
as of 11/04/2026 07:06 PST - Details
650GoldATXNon-modularATX 3.18.2$47.97
as of 11/04/2026 07:06 PST - Details
600GoldATXNon-modular8.1$59.99
as of 11/04/2026 08:06 PST - Details
1000GoldATXFully modularATX 3.19.3$94.99
as of 11/04/2026 07:06 PST - Details

Before you buy

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