ASRock Z790 Nova WiFi Has Six M.2 NVMe Slots, Reinforced GPU Support ...
So, we can say that I can install two M.2 SATA SSDs on my M.2 NVMe SSD slots. However, two M.2 NVMe slots controlled that are directly connected to the CPU only support the M.2 NVMe drives.
GIGABYTE B550M AORUS ELITE AX (rev 1.3) AM4 AMD B550 Micro-ATX ...
B550M AORUS ELITE focuses on providing M.2 technology for users who want to maximize their system potential.
What generation are the NVMe slots? – Q&A – Best Buy
Dual M.2: This ATX motherboard is equipped with flash NVME M.2 (PCIe 3.0 X4 bandwidth) and AHCI M.2 (SATA 6Gbps) slots, of which NVME M.2 maximum speed Up to 32Gbps.
Mainboard Asrock B450m Steel Legend (amd B450, Socket Am4, M-atx
As for integrated components, the ASRock B450 and B450M Steel Legends share the same controllers including a Realtek ALC892 audio codec, Realtek RTL8111H NIC, and two PCIe 3.0 M.2 slots (one x4 and the other x2).