I see the chart with the mhz, gh/s, and watts. It doesn't have amps though.  But I guess if i take 300mhz = 6.795w / 5v = 1.359a

My hub has 2.1a per port, x 5v = 10.5w. Based on the chart, I'm guessing 10.5w would be around 490mhz. That would explain why 1 or 2 sticks start lagging behind when I run them at 500mhz.

Sorry, I'm new to all this, but I'm starting to get the hang of it.
Thanks!