I have a B550-F Gaming (non-wifi) in which I tuned the voltage while using the BIOS 2604.
I always set PBO to motherboard, and set the PBO curve to negative with the following voltages.

Negative:
Core 0 25mV
Core 1 0mV
Core 2 25mV
Core 3 25mV
Core 4 10mV
Core 5 25mV

When I updated to 2803 (agesa 1.2.0.7), I decided to test again using CoreCycler and prime95 for all cores stability.
What I found is that this new BIOS allowed me to downvolt a little further, now to:

Negative:
Core 0 25mV
Core 1 0mV
Core 2 25mV
Core 3 25mV
Core 4 20mV << now its stable with -20.
Core 5 25mV

Can someone confirm if this is expected? Tested prime95 for 6 hours, no crash.. With the previous BIOS, I couldn't run for more than 15 minutes with the core4 -20, stable only with -10.

I'm getting 12044 points in CB23 with this new BIOS, which is my record..