Do I have the first bad 841?  I’m thinking the fan or control board is bad. The fan sounds like a child with severe ADHD is cranking the fan speed up and down constantly.  The temperature on the outlet was reaching 94C and I read that these miners have a target of 70C, unlike the 741...so I unplugged it.  It was doing a normal 13.5+TH/s.  The fan speed was set to 100% and the readout in CGminer would vary between 3000 and 5000RPM, although it only seems to update every 5 seconds so it depended where the adhd kid had the speed set when the info refreshed.

Sound familiar to any other 821 or 741 issues?