Upgrading from 7700k to B550 - lookig for people with experiences

Anybody with B550, Ryzen 3 and HL:Alyx in VFIO?
Alyx, Quake Champions, MTG Arena and few other titles are really struggling with my 7700K (I am talking less than 60% of the performance natively)
It is clear from all the games I try - performance loss is not linear at all.

I am thinking of upgrading and wondering about IOMM and power. Mainly two questions:

  • Anything below 10600K viable for Alyx and IOMM
  • Performance losses on those many-core systems. I am worried about those systems with many cores as I am quite certain the boost without MCE will suck in QEMU.