[km3k]

FYI It's actually 8 years old for the EeePC 901 and the last 32-bit Atoms came out in 2009.

[DanBC]

The processors are now 64 bit, but the low ram means you're going to suffer if you use a 64 bit OS.

Also, for some of these machines they use a 32 bit UEFI, so even if you want to use a 64 bit OS you'll need some weird tinkering to get it installed.

[jonathonf]

I erred on the side of caution. :)

I've successfully run Arch on a set of 10 EeePC 901s for a club. Linux plus Arduino programming = awesome kids.