Looking at asus's 4x nvme bifurcation card you cannot use an igpu enabled processor and maintain 4x4 with any CPU. I don't want to fill a slot with a dedicated GPU.
For a NAS I don't need 4 in a pool, just 2 per slot works fine with HDD backups.
For a NAS I don't need 4 in a pool, just 2 per slot works fine with HDD backups.
The budget Ryzen 8000 CPUs are indeed quite limited, which is a shame if you wanted to go for an 8000G APU to use its powerful iGPU for transcoding.
For AM4: The ASUS card (at least the one I'm looking at) is PCIe4 4x4, while APUs only expose PCIe3. Should still work but over PCIe3 with X570. I've been running PCIe3 4x4 cards from other makers on that chipset and did not notice any issues.
For AM5 I don't see why not?
I have not tried but something like this might be what you are looking for? https://aliexpress.com/item/1005005311953959.html
There are bifurcation cards from other makers with other configurations also exposing two m2 slots, if you look around. E.g. https://www.10gtek.com/nvmessdadapterforu.2ssd
[0]: OK, total bandwidth is still obviously up because we have gained a PCIe generation but still I'd have expected available lane-count to not drop.
Under CPU section.