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Any info on it? Noticed firmware for it about a week ago on Canaan's site.

Canaan renamed it to the A831 (https://github.com/Canaan-Creative/cgminer/commit/4fafa6f4aaf593b463edf1cfdb28d61a847d9078) about 19 hours ago.

Thank you I will look this up.




https://github.com/Canaan-Creative/avalon8-docs/wiki/AvalonMiner-841-firmware-downloads


this was all I could find.  for A841  not A831

if you look here, there is a folder with firmware for the A831

https://canaan.io/downloads/software/

And there is now also one folder for AvalonMiner 851.
Hmm, interesting development.. :)

Here (https://github.com/Canaan-Creative/cgminer/commit/63648cfad35ff26bdd7a219ed5441e73544e9415) are the changes made to Canaan's avalon8-dev (https://github.com/Canaan-Creative/cgminer/tree/avalon8-dev) branch of their cgminer repository to add support for the A851.

It looks like the A851 may simply be an overclocked version of the A841, judging from the increased base frequency setting (AVA8_DEFAULT_FREQUENCY_825M) in line 170 (https://github.com/Canaan-Creative/cgminer/blob/avalon8-dev/driver-avalon8.c#L170) of driver-avalon8.c in the avalon8-dev branch. The A841 uses a base frequency setting of AVA8_DEFAULT_FREQUENCY_775M (https://github.com/Canaan-Creative/cgminer/blob/avalon8/driver-avalon8.c#L162).

Similarly, the A831 may either be an overclocked version of the A821 or an underclocked version of the A841. The A831 uses a base frequency setting of AVA8_DEFAULT_FREQUENCY_725M (https://github.com/Canaan-Creative/cgminer/blob/avalon8/driver-avalon8.c#L147).

The rest of the cgminer code is the same for the A821, A831, A841, and A851.

Note that the addition of support for the A831 and the A851 are in separate branches of Canaan's cgminer repository — code for the A831 is found only in the avalon8 (https://github.com/Canaan-Creative/cgminer/tree/avalon8) branch and code for the A851 is found only in the avalon8-dev (https://github.com/Canaan-Creative/cgminer/tree/avalon8-dev) branch. This suggests that Canaan may not be looking to release two new models, but may instead be looking to see which model — the A831 or the A851 — would be most viable for release, possibly as a replacement for the preceding model.

On a side note, Canaan also recently added two new experimental options (https://github.com/Canaan-Creative/cgminer/commit/509961b8002fa3ed9ead0b74ff2d537017bf9899) in the avalon8-dev branch: --avalon8-spdlow and --avalon8-spdhigh. I don't know what spd stands for, but if it is shorthand for speed, then we may be looking at potential options to select arbitrary levels of lower and upper frequency bounds for the A8s, similar to how we are currently able to set arbitrary voltage levels and voltage level offset values. Both --avalon8-spdlow and --avalon8-spdhigh are configurable using integer values from 0 to 3 (https://github.com/Canaan-Creative/cgminer/commit/509961b8002fa3ed9ead0b74ff2d537017bf9899#diff-2375962b4c57dbf36c966897727ed064R1581).

@ frodo

 I will have to test it I am going to need to order more avalon 841's to test side by side.

I'll try the 851 tomorrow and the 831 later, and post my findings

Didnt avalon have one with a built in PSU for the china market only? Could this be more of those?