...the 4k footage clocks in at 67% CPU use vs the 1800X's 76%. Not sure how twice the number of active units provides so little in return, but there you are.
For those watching from home -- running in NUMA is a net loss. The software supports it, and I already tried that. Which is odd, and a shame, but there you are. Maybe "channel" mode is not the right thing to set in the Taichi board? I was confused why I wouldn't use "die", but the ASRock BIOS .. yeesh.
Anyway, if I'm right (and it seems a reasonable theory, although it's just as easy to theorize this is really RAM and not IF :|), the next time AMD tells me that their IF subsystem ... well, let's just say that the rumors of no NUMA in single socket Rome is *very* interesting to me. And if AMD wants a test to run against, I'd be more than happy....
Ed: Got 3466 stable by "upping" my LLC on the SoC to 3 (from 5). Only good for 2-3% -- about half of what one might expect. Random observation: halving and then re-doubling the size of the 1080 clip (I've got it resizing into 4k) is actually good for another 4% speed improvement. :shrug: Oh, and idle is more stable in mid 30s.