I have an i3-9100f and I recently installed XTU and was just fiddling with settings a bit and then after undervolting and turbo boost power max my processor shot up to 4.1 GHz on all cores... And it now is stable at 4 GHz and occasionally reaches 4.09GHz and is fluctuating... I am a total newbie...
OK Guys. I wish I knew how to delete the other post I made somehow. I wanted to pick the responded as the answer but for some reason that option is not available. The OP really helped me though.
I checked ASUS site and it seems to be saying this board is fully compatible with I3-9100 Coffee...