Motherboards under $400

2 motherboards under $400 from ASUS, Supermicro, GIGABYTE and more. Prices run $330 to $350.

GIGABYTESpec score 8.6

AM5, ATX, DDR5, 4 Memory slots

+Wi-Fi 7: the highest wi-fi of the 14 here

+5G: only 1 of 15 here have a higher wired lan

$329.99-13%List: ~~$379.99~~

as of 11/04/2026 15:08 PST - Details

ASUSSpec score 9.0

AM5, mATX, DDR5, 4 M.2 slots

+Compact mATX form factor for smaller builds

+AMD B850 chipset for AM5 Ryzen processors

+Four M.2 slots for multiple storage drives

−Fewer expansion options than full ATX boards

$350.77

as of 11/04/2026 12:10 PST - Details

Compare specs

motherboard	Socket	Form factor	Memory type	Chipset	Spec score	Price
	AM5	ATX	DDR5	AMD X870E	8.6	$329.99 as of 11/04/2026 15:08 PST - Details
	AM5	mATX	DDR5	AMD B850	9.0	$350.77 as of 11/04/2026 12:10 PST - Details

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