MSI Announces The MEG X570 Godlike: Five M.2, PCIe 4.0 and 10G LAN
ASUS Prime H610M-A D4 Intel H610 (LGA 1700) m-ATX motherboard with DDR4, PCIe 4.0, dual M.2 slots, DisplayPort, HDMI, D-Sub, USB 3.2 Gen 2 ports, SATA 6 Gbps, Addressable Gen 2 headers
ASUS PRIME B550-PLUS AMD B550 (Ryzen AM4) ATX Motherboard (dual M.2, PCIe 4.0, DDR4 4400, 1 Gb Ethernet, DisplayPort/HDMI, USB 3.2 Gen 2 Type-A and Type-C, Aura Sync RGB Headers Support) :
Gigabyte Z390 D Motherboard Intel Z390 LGA 1151 4 x DDR4 M.2 ATX HDMI PS/2 RJ-45 | eBay
ProArt X570-CREATOR WIFI|Motherboards|ASUS United Kingdom
Gigabyte B550 Aorus Master has three working PCIe Gen4 M.2. SSD Slots
MSI AMD Ryzen PRO B650M-A WIFI6E AM5 PCIe 4.0 DDR5 MicroATX Motherboard LN129285 | SCAN UK
ASUS PRIME H510M-K, Intel H510 (LGA 1200) micro ATX motherboard with PCIe 4.0, 32Gbps M.2 slot
ASUS AM4 TUF Gaming X570-Plus ATX Motherboard with PCIe 4.0, Dual M.2, 12+2 with Dr. MOS Power Stage, HDMI, DP, SATA 6Gbps, USB 3.2 Gen 2 and Aura Sync RGB Lighting :
Asus publishes X470 and B450 PCIe Gen 4 compatibility chart - Mainboard - News - HEXUS.net