NVlink / SLI for transcoding?

[TheDreadPirate]

VRAM only matters for for tone mapping (converting HDR to SDR). If most of your content is 4K it is likely most of it is HDR and most transcodes would also involve tone mapping.

As for your question about SLI, I have no idea. I'm not aware of any documentation about it one way or the other.

Perhaps consider Intel Arc? The cards are cheaper while still being extremely capable for transcoding. The Intel Arc A380 in my system can do about 5-6 tone mapped HDR to SDR streams with its 6GB of RAM. Plain transcoding without tone mapping, it can do about 20. And only costs ~$120, often closer to $100.