Power Supplies under $100

3 power supplies under $100 from Rosewill, Thermaltake, MSI and more. Prices run $40 to $49.

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

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 11/04/2026 14:09 PST - Details

RosewillSpec score 8.9

500 Watts, Fully modular

+500W output for Mini ITX and Flex ATX builds

+Fully modular design reduces cable clutter

+1U form factor for compact systems

$49.99

as of 11/04/2026 07:06 PST - Details

Compare specs

Watts	Efficiency	Form	Modular	Spec score	Price
500		ATX		n/a	$39.99 as of 11/04/2026 08:06 PST - Details
500	Gold		Fully modular	8.9	$49.98 as of 11/04/2026 14:09 PST - Details
500			Fully modular	8.9	$49.99 as of 11/04/2026 07:06 PST - Details

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