AORUS B450 Elite

Good morning, technical question:

I had a rig with 3 1660S and recently changed MOBO to use a Ryzen 7 3700X to mine RTM as well:

It turns out that after configuring the MOBO as usual, the 1660S do not go over 22mh/s, obviously repeating the previous OC that reached 31mh/s.

The model is AORUS B450 Elite: it has PCIE speed in GEN 2 and Above 4G decoding enabled. Is there anyone else who has used this MOBO for mining ?

Thank you very much.