Has anyone seen oscillation in the 741 temperature/hashrate? Meaning that hashrate creeps up over time to some point at which the temperature spikes, causing the fan to peg to 100% and HW errors backing down the hashrate.. Then it repeats. The one I'm looking at has a freakout about every 30 minutes. Voltage offset is -2, frequency is nominally 702MHz and hashrate about 7.2T.
I remember Steve from Canaan, talking about the way the miner hashes causing it to oscillate sort of like that. If the chips can they work harder to a certain point, and then when the failures/rejects start to climb it ramps back down.
I don't remember it really tying into temps to much, but if it is overheating you would probably get the same result.
What are your temps like on the Miner status? What is the rooms ambient temperature? Is there a reason you went with -2 offset?
My 741's have a pretty wide range in hashrate between the 2 of them but at 0 they average out to about 7.8 TH/S
yeah that could be the issue the fan is pointed wrong
Glad you found the issue, it seems a few have snuck through QC, I guess in a Data center the airflow must be enough to keep them running cool
