Runs Linux natively it seems: https://www.phoronix.com/scan.php?page=article&item=ampere-a...
Edit : I know Linux is customized to run on a variety of hardware, I was just pointing out that I never knew you could install Ubuntu on the mentioned hardware and have it take advantage of the available hardware, given that it has specialized hardware.
https://unix.stackexchange.com/questions/4507/how-many-cores...
That said, I agree with you that it isn't particularly surprising that Linux handles lots of cores fine, it's been run on more esoteric hardware for ages.