[bodyfour]

No compiler issues to speak of.

* They're not nearly as fast as an Intel server CPU. If you have a task that can be easily split across any number of machines this may not matter, but not every case is like that. For many tasks it's just more pleasant to have 10 fast machines than 50 slow ones.

* They're only 32-bit and 4GB is pretty small for a server these days. Aarch64 will address that whenever they become available and cheap.

* The low-CPU low-RAM tasks that todays ARM servers are well situated for is also easily handled by virtualized x86 in enterprise environments.

I'm a big ARM fan -- I've got 6 or 7 ARM machines I play with from time to time on my home network -- so I hope they make a credible run at the server space.