MSI B450 Mortar Max supports PCIe lanes and NVMe SSDs.
MSI B450 Mortar Max supports PCIe lanes and NVMe SSDs.
The board features two M2 slots, but I'm unsure if using both will slow down the GPU. The spec page explains that one M2 slot is PCI-E4, while the other is for M.2 SSDs. It mentions that when an M.2 SSD is installed in the PCI-E4 slot, it might affect the PCIe 3.0x16 slot speed for the GPU. This second SSD could function similarly to a PCIe SSD in the PCI-E2x16 slot. For a clear understanding, look for beginner-friendly guides on PCIe and SSD compatibility.
I acquired the motherboard, though I lack two NVMe drivers for testing. However, the instruction manual mentions that the bottom PCI-E port will be turned off when two NVMe drives are installed, which means the upper PCI slot for the GPU remains unaffected.