419Mining, LLC states in all sales that active cooling is recommended even at stock speeds.
Bear in mind, a simple desk fan can be considered active cooling, most people even use something as simple as this USB fan:
https://www.ebay.com/itm/254154810314.
I use two of these on my GekkoScience hubs running 6 NewPacs at 200 Mhz
Overkill but if one fan fails, I'm still OK
Nice and cool & very quiet

