Pretty sure truenas scale can host everything you want so you might only want one server. Use Epyc for the pcie lanes, and a fractal design r7 XL and you could even escape needing a rack mount if you wanted. Use a pcie to m.2 adapter and you could easily host apps on them on a mirrored pool and use a special vdev to speed up the HDD storage pool

The role of the proxmox server would essentially be filled by apps and/or VM you could turn on or off as needed.

Have you got a recent copy of the configuration file?

Yeah, this.

I have a supermicro with an epyc processor. 7 x16 slots and 2 x8 slots. I only need one x8 slot for a HBA card, the other could be used for one of these cards. It should be able to pull a couple of separate transcoding streams at any one time.

Boo, I wanted one to go in a x8 slot, would make for a great jellyfin transponder in actual server hardware.

Thanks for the link.

Do they only need a PCIE 4.0 x8 slot? The card length makes it look like a x8 in a x16 slot…m