Motherboards under $400

4 motherboards under $400 from ASUS, Supermicro, GIGABYTE and more. Prices run $345 to $397.

Generic

AM4, 4 Memory slots, AMD B450

+Four DDR4 memory slots for expansion

+NVMe M.2 slot with PCIe 3.0 support

+AM4 socket supports Ryzen processors

−Specifications do not list the form factor

$346.36

as of 11/04/2026 15:07 PST - Details

Generic

AM4, mATX, DDR4, AMD A520

+AMD A520 chipset for AM4 processors

+Micro ATX form factor fits compact builds

+DDR4 memory support for AM4 platforms

−A520 chipset does not support CPU overclocking

$344.76

as of 11/04/2026 00:16 PST - Details

Generic

AM4, ATX, 4 Memory slots, AMD B450

+ATX form factor fits standard full-size cases

+AMD B450 chipset for AM4 processors

+AM4 socket for Ryzen processors

$352.04

as of 11/04/2026 00:16 PST - Details

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AM4, ATX, DDR4, AMD X570

+AMD X570 chipset for AM4 Ryzen processors

+PCI-E 4.0 support for fast expansion cards

+DDR4 memory support

$397.02

as of 11/04/2026 00:16 PST - Details

Compare specs

Socket	Form factor	Memory type	Chipset	Spec score	Price
AM4			AMD B450	n/a	$346.36 as of 11/04/2026 15:07 PST - Details
AM4	mATX	DDR4	AMD A520	n/a	$344.76 as of 11/04/2026 00:16 PST - Details
AM4	ATX		AMD B450	n/a	$352.04 as of 11/04/2026 00:16 PST - Details
AM4	ATX	DDR4	AMD X570	n/a	$397.02 as of 11/04/2026 00:16 PST - Details

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