The appliance is using a 32-bit Fedora-based OS.

> Even with hardware virtualization enabled, though, virtual machines
> might still feel slow if your computer is a few years old, has a CPU
> that’s only 1GHz or so, or has only 1GB or so of RAM.

You can find all the information about the cs50 appliance [here][1]!


  [1]: http://cs50.net/appliance