ASUS EX-B660M-V5 D4 mainboard Intel® B660 (LGA 1700) mATX motherboard with PCIe® 4.0, 8 power stages, Realtek 1 Gb Ethernet, HDMI®, D-Sub, USB 3.2 Gen 1, DDR4 5333 (OC), luminous anti-moisture coating - Newegg.com
ASUS Prime B660M-A D4 LGA 1700(Intel 12th Gen) mATX Motherboard (PCIe 4.0, DDR4,2xM.2 Slots, 1Gb LAN, DP,2 x HDMI, Rear USB 3.2 Gen 2, Front USB 3.2 Gen 1 Type-C, Aura Sync)
PCIe 4.0 vs. 3.0: Gaming- & SSD-Test mit dem HMX3-Mainboard MSI MEG X570 Godlike - YouTube
Asus publishes X470 and B450 PCIe Gen 4 compatibility chart - Mainboard - News - HEXUS.net