Which is the first FAN ? inlet or outlet fan. ?
What Fan model are you using that gives you 2000rpm silent fan ?
Can't it work if i replaced both fans with the silent fans ?
I replaced the outlet fan with a silent model: scythe slipstream 1900
You can't replace both as it will detect a too low fan rpm during startup.
You need to pass through the fan rpm wire (yellow one) to the slipstream 1900 one (so completely remove the yellow wire of the new fan)
I run my miner now @700 watts with the fans both around 1900 rpm. This is really silent compared to the original values.