As far as I know (I have yet to recieve my device, but I do have a compatible 65W charger) it should be able to charge at 20V 3.25A (65W)
Worst case scenario it will just charge at the minimum speed available. There are all kind of handshakes and confirmations that happen before power is delivered from the charger to the phone.
I have for example a type c charger brick from my hp elitebook laptop.
It has the same V/A ratio to do the 65w charging as the original xiaomi charger i posted above.
It does not work charging at 65w with the mi 11 ultra.
Be careful what charger you use and also the cable is very important !
I believe the CN version comes without a charger, does that apply to international version as well? In all unboxing I've seen of international version they came with a charger, want to confirm by anyone who got his international version since mine still needs 2 weeks to be here. Anyone can confirm please?