claymore, my 8g rx480 shows memory usage of 60% and GPU usage of 100% with drops to 0% several times a minute. Do you think it might take another thread?
GPU and memory are busy completely, you can check it by starting two miner instances, you will not get more speed.
Due to PoW implementation, GPU cannot utilize all its resources, so you don't see 100%.
Claymore, after a more detailed analysis it seems to be associated with a new job. Perhaps my old mobo still on pci-e 2?