I'm trying to overclock some whatsminers right now with 2 PSUs. Usually it works fine, pulling power like it should, until after about 20 minutes I get an error of 505x or 901 depending on how high I have my power consumption settings. Anyone here have any experience dealing with these errors? I don't know where to start troubleshooting, but I have a feeling it has to do with the finer points of tuning the firmware's frequency and other power related specs.
Are you doing this air-cooled? please explain a little about your setup, I have never seen the 901 error, but anything that starts with 50 always has to do with the temperature of something, the last two digits will tell you exactly what part is getting hot, but ya judging by the fact that you are "overclocking" the miners -- then it's very likely the error is caused by some temp issues.