Thanks. I’m gonna order an S9! Can you share which noctua fan models you ordered to replace the non-PSU fans? Also have you ever experimented with a 3D printed silencer like this? I may try and report back.

https://www.etsy.com/listing/973407348/antminer-s9l3-fan-noise-reduction?ref=share_v4_lx

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Oh interesting. I might try printing something like that. I'd imagine something like that will disrupt airflow though. You might want to test efficiency of that vs simply turning the wattage down. Would be neat to see a chart with temp, volume, and wattage!

For the Noctua 120mm, youll need to 3d print an adaptor (check ceypto cloaks), I am running the NF-A14 IndustrialPPC 3000 PWM version. There's several flavors of the NF-A14. The normal case fans will probably be quietest but I think they max out around 1800 rpm. There are two industrial versions that max at 2k vs 3k rpm. Generally, volume is directly proportional to RPMs. At 800 watts my fans typically spin around 1800 rpm. I went with the 3k version for longevity amd to give myself headroom if I wanted to run at higher wattage at some point

For the power supply I'm using NF-A6x25 noctua fans which I highly recommend.

Also check crypto cloaks guide. It's very good and was what I primarily followed.

Interesting - didn’t know there was an adapter needed. I thought the fans just had to be modified by clipping some plastic. I’ll have to check out their guide in more detail. Thanks!

Yeah the standard fans are 90mm. I suggest going with 120mm. I don't see any way to connect them up properly without an adapter. The holes don't line up otherwise.

Hey sorry quick correction to all this... The stock fans are 120mm amd the noctuas I put on are 140. Go with the 140 + adapter. Moves more air at lower rpm/noise.

Okay thanks. Thats consistent with what I’m seeing too. Need to look at getting a couple adapters from cryptocloaks

Awesome conversation. Thanks for sharing all this info!