AROS is great, and Icaros Desktop has been probably the most well-known distribution out there. Their 32bit, single core version is very useful. Now, they’ve released a very early 64 bit version.
There are heavy warnings that this isn’t anything other than a work-in-progress, proof-of-concept version that won’t replace the existing 32bit version for a while. it does give us something to play with though.
It does support SMP (more than one core). It also identified the CPU (under VirtualBox).
Get the download –> here <–