I have 2 of these and just got an Eyeboot 10 port hub with the 120w powersupply.  I can get them up to 500mhz max, actually 1 gets to 500 and one to  490. Should, in theory, I be able to run 2 at higher speeds on this hub?  I am running on a Pi4b 8gb I had that was just sitting there doing nothing.

The hash rate jumps from back and forth from 380 to 810, is that also normal?

What's the highest that is realistic with these?