My rig was running fine for months without hdmi dummy plug and after Windows 10 updated to version 1709, it stopped.
First gpu started to hash 0 mh/s so I had to buy cheap hdmi dummy plug.
After I pluged it in, it works fine now.
I was wondering, how come gpu could work without hdmi dummy plug before, and after windows updated it can only run with hdmi dummy plug?
I used same drivers before and after windows update.
Gpus are rx 470 4gb.