C-state, P-state, ACPI... still guest CPU is not scaling

My CPUs (Opteron 4280) is capable of

I have 14 cores assigned to a Windows 10 VMs according and to task manager this run constantly at 2.8GHz no matter if idle or encoding videos. Tried ESXi Power management to Balanced and high Performance = same result

I have compared task manager on my local PC and I can see  the frequency instead changes constantly based on the usage.

Does anybody have a good idea on how to take the most of my CPUs when it comes to ESXi 6.5 and CPU scaling/boosting? perhaps changing further the BIOS settings of my tyan S8225?

p.s. I currently have C6 + C1E + ACPI + PowerNow + P0 state enabled

Thanks!