s9 hardware/firmware question

[squall1066]

not sure if in right section, but here goes:-

I have some mish mash of units I want to try and combine, (I have alot of 1 and 2 board units) and I want more info on what is compatible, for example, I have a s9 hashboard form an old miner that still works, its was run on the older firmware that you could change frequency and fan speed, can I put this board into a newer firmware (auto-tune) rig and run it along side ok?

and is the reverse of this possible? can I put a newer board into a older firmware s9 rig and change its frequency?

I do understand there have been reports of non compatibility of upgrading firmware on an older unit, also interested in "downgrading" firmware to non auto tune rigs, anyone know what is possible between all of these versions?

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[fanatic26]

You can but sometimes the results are very confusing. I would warn against mixing board revisions if at all possible

[squall1066]

still looking for anything definitive, any board versions that are known not to mix with certain firmware versions?