This is the link to the card:
http://sapphirenitro.sapphiretech.com/en/vega64le.html
At first glance, it just looks normal; nothing outstanding at all. Maybe mine's a fluke? Maybe it was so much metal (it's so damn heavy) that the fans spin, but don't need to do it at full force all the time? I haven't checked RPMs themselves for top speeds, but the reported ones are, like I said, silent compared to the RX480 Nitro.
If I read the tech-sheet, the fans are the "common" ones:
Cooling:
Tri-X fans
Two ball bearing
Vapor-X chamber
Maybe they improved the vapor chamber tech?
Cheers!