Hello Doctor

I have these cards on Asrock h110 13slots

2*Rx 560 4GB--------500    h/s
3*Rx 470 4GB--------670    h/s
3*Rx 470 8GB--------880    h/s
Rx 480 8GB----------1050   h/s
Rx 570 4GB-----------700    h/s


my hashrate dropping alot

its not intensity problem , ive tried alot of numbers with/without double_threads

swinging hashrate -20%

i set virtual memory 100 GB