Using ARC on old hardware for encoding / 2D-only?

[NattyKathy]

Stuffing an A380 in a random FX or Zen1 box sounds enticing for a cheap recording/streaming system that avoids NV drivers and the audio latency issues they can cause but I'm confused as to the actual real-world limitations of Arc on old chipsets.
Is encoding / transcoding (including realtime 4K60) affected by lack of ReBAR and using, say, PCIe 2.0?
Do DX11-accelerated 2D apps (OBS, video players with effects/overlay, etc) work acceptably without ReBAR?

I've seen various anecdotes around but not much detail, anyone here have experience using one on older platforms for exclusively non-gaming, non-3D content creation stuff?

 

[arestavo]

My understanding (from the little interest that I took in Arc) is that if your motherboard doesn't support REBAR, then the Intel GPU has an extremely high chance of not working at all in that board.

I can't recall if I saw that in a Linus Tech Tips video, or a Gamers Nexus one.

 

[wareyore]

My understanding (from the little interest that I took in Arc) is that if your motherboard doesn't support REBAR, then the Intel GPU has an extremely high chance of not working at all in that board.

Yep - performance is ugly in gaming. Not sure what it does to content creation tasks but assume it'll have an adverse impact if there is no rebar or similar support.

https://www.tomshardware.com/news/arc-a770-loses-25-percent-performance-without-resizable-bar
https://www.intel.com/content/www/us/en/support/articles/000091128/graphics.html