@Migishand it's been said many times for other manufactures that have QOS there is no benefit using it if your link speed is above 300mbps.

raven-au wrote

  @Migishand it's been said many times for other manufactures that have QOS there is no benefit using it if your link speed is above 300mbps.

I think it's dependant on your use case, latency is very important for me. Currently when downloads or uploads happen on the network my ping raises up >60ms which makes GeForce Now and gaming in general less that ideal. 

  @Migishand  right, then you would need to set those devices to high priority, I believe that will put io requests for those devices at the head of output packet queue.

Other than that my experience with other QOS implementations appears that some percentage of the available bandwidth is not available until there is extra io pressure so that responses remain fairly good. This doesn't always work under heavy load but is usually pretty good. Together with the above it should provide good results most of the time.