Asrock.
-Asrock X399 Taichi:
-Asrock X399M Taichi:
-Asrock X399 Professional gaming
Main cpu Vcore vrm.
- pwm: IR35201 in 8+0 phase mode, so 8 true phases.
- powerstages: IR3555 60A fully intergrated powerstages.
- Inductors: 60A.
- output caps: Tantalum´s.
Soc vrm:
- pwm: a second IR35201 pwm is providing 3 phases for controling the SOC vrm.
- powerstagesa: IR3555 again.
Memory vrm:
- pwm: 2x uP1647P pwm’s providing 2 phases for each set of 4 dimm slots.
- mosfets: Sinopower SM7341EHKP dual-N Mosfets.
So thats why Asrock is marketing it as an 11 phase board.
Because there are two IR35201 pwm´s on it.
All the 3 Asrock boards listed share the same vrm.