Re: Avalon 8 official specs released

Sheesh, fans set for 100% all the time in the 821 firmware... Anyone played with setting it back to something reasonable like 50% or 20, like I ran the 741's and let the temp circuit moderate the fan speed as needed to keep 90 degrees on the outlet? I guess I'll see what outlet temps I've got first, but my basement this time of year is pretty dang cold, and I'd just as soon trade off some noise if appropriate.

What's your 'minimum fan speed' setting in the Cgminer configuration?
I'm guessing it is 100.
Set it to 20 and see how the miner acts in your environment.
Note that 20 is only the minimum value and miner will control the fan speed up or down in relation with the miner temperature.

yes, by default the firmware has 100% in that min fan speed and I suspect I know why, the internal temp that they attempt to keep the outlet at is 70 and to do so, it appears to take 100% fan typically.

You can put something like:

--avalon8-fan 1-80 --avalon8-temp 90

in the 'More Options' box if you want to change the target temperature and fan speeds. Haven't played around with it too much but 80% fan speed still kept mine at a reasonable temperature so far. The difference between 80% and 100% fan was only a couple degrees after a few minutes.

Yeah, but I wonder if they are *trying to keep* the outlet temp at 70. The 741 runs at approx 90 and thats what set value it has in the cgminer code. So someone must want the 821's to be at 70. I'd hate to adjust that and burn up an 821. I suspect the current/voltage changes pretty dramatically as the temps rise on the ASICs. And from others testing, the -1 undervolt has the opposite effect - hashrate and wattage goes UP, not the other way around... Be curious of others findings?