B550 motherboard with PCIe 4.0 compatibility
B550 motherboard with PCIe 4.0 compatibility
On the MSI website, it states that only the Gen 3 model is compatible with that board
It shouldn’t be an issue. I’m not sure you’ll reach the full 3.9 GB/s on the PCI-e 3.0 x4 slot. There might be a better reason for choosing that specific motherboard—other B550 models are widely available.
The closest option to the ASUS TUF is about $20 higher. Your B550-A Pro remains in stock for $139, which is a solid offer since it includes a dedicated flash button and shares VRMs with some X470 models. If it hasn't arrived yet, consider adjusting your order to a pricier model. If not, you're safe—this board will function just fine.