Dedoimedo posted a tutorial explaining how to install and use SteamOS as a guest operating system in a virtual machine inside VirtualBox
You've just read my SteamOS review. You like it. But you are dismayed by the horrible system requirements. Yup, you need a powerful machine with a modern processor, you need a heap of RAM, a ton of hard disk, and one of the leading graphics cards. Well, not really.How to setup and test SteamOS as a virtual machine
How about we kind of work around all these requirements? This is what I'm going to show you today. How you can install and test SteamOS as a virtual machine, using very limited resources and with zero risk to your physical setup. We will do that using the SteamOS installer archive and VirtualBox. Sounds good. Now follow me.