1A per USB port may not be enough to run them at 500
The Sidehack USB hub provides up to 6A per port (shared between two ports)
No, 1A will never work with these. I tried with a 2.4A hub and it didn't even get above like half frequency; however these sticks are made for OC and run especially bad at lower frequency, so hashrate was abysmal. Changing to a GekkoScience hub immediately fixed it.