A couple of days ago i bought the ocelot OGM27-01 monitor, it works fine with my Dell G5 SE 5505, but everytime I open a game it works for around 5 minutes and then the perfomance of the laptop drops really bad, I suspect my laptop tries to change the process between the gpu and the cpu, I have found no other explanation, I dont know if it is a problem of the amd graphic card or with the laptop.
Also, the laptop works fine without the monitor when playing games, there are no perfomance issues, it only happens when the games are being executed in the external monitor.