MSI B550 Gaming GEN3 Gaming Motherboard (AMD AM4, DDR4, PCIe 3.0 ...
In our Gigabyte MZ72-HB0 review, we see how this dual AMD EPYC motherboard is able to fit a lot of PCIe Gen4 expansion into EATX dimensions.
How Many PCIe Lanes Does M.2 Slot Use? - PC Guide 101
The B550MX/E PRO is a MicroATX motherboard with a B550 chipset compatible with the Ryzen 5000 series.Simple yet uncompromised configurations include 10-phase power circuits with "Digital PWM" and PCIe 4.0 and PCIe 4.0 M.2 slots.
Gigabyte MZ72-HB0 Review Dual AMD EPYC Motherboard with 10GbE - ServeTheHome
In our Gigabyte MZ72-HB0 review, we see how this dual AMD EPYC motherboard is able to fit a lot of PCIe Gen4 expansion into EATX dimensions