The fan is pretty quiet, at least—I couldn't hear it unless I put my ear up to the box.
The coil whine was excessive though. I wouldn't normally mention it if it were here and there and quiet, but it was noticeable from a few feet away any time I went above 100 mbps down over Ethernet.
That is interesting - I noticed that in your video, and I suspect a little shielding around the Ethernet electronics might help (but I have no real idea how the Ethernet was integrated into the Surface motherboard variant).
The coil whine was excessive though. I wouldn't normally mention it if it were here and there and quiet, but it was noticeable from a few feet away any time I went above 100 mbps down over Ethernet.