To add my personal experience with bios flashing to the discussion - I found that the EVGA SC2 ROM got my fan speed floor on my 1080ti mini down to 0% without disabling hdmi audio. Anyone having issues with their 1080ti mini bios can shoot me a PM with their email address and I'll send you the ROM that I'm using, I'm not 100% sure which link I got it from anymore.
I've been watching some videos about the 1080ti mini. Apparently it doesn't have any input filtering chokes. Does anyone know if there would be any tangible gain to DIYing in some input filtering chokes somehow?
I assume you refer to Buildzoid's video?
I think he explains that effect of not having input filtering chokes is that if your PSU is operating close to 100% load, current spikes that would have otherwise been filtered out by the card instead would trip the PSU. I don't think he made a big deal out of it. The VRM component choices were his biggest issue with the 1080ti mini. But even those are fine at stock.