Yeah, well if there is a sound, I can't hear it on mine, but then I have tinnitus. So who knows?
Seriously, zero sound coming from mine. I have yet to hear the fans. But I have two OWC 4M2 RAIDs sitting next to it that have pretty noisy fans, but what does one expect with eight NVME SSDs running inside those boxes? Also on the desk is a SanDisk Thunderbolt 3 12TB G-Drive and it's darn silent too.
On a side note I had to replace a fan on one of the 4M2 raids, and OWC doesn't carry replacement parts for the original version. So I had to pull it out and track down the manufacturer. I got them to ship me two of the fans from China ($11 each, shipping $35). No more OWC proprietary purchases for me.