Steam OS is finally available for download, but Valve does recommend that you are fairly familiar with Linux and partitioning hard drives, as it isn't a simple install for your average user.

Here are the system requirements:

Hardware Requirements
  • Processor: Intel or AMD 64-bit capable processor
  • Memory: 4GB or more RAM
  • Hard Drive: 500GB or larger disk
  • Video Card: NVIDIA graphics card
    • AMD and Intel support coming soon
  • Additional: UEFI boot support, and USB port for installation
How to Install

You will need to create a SteamOS System Restore USB stick to perform this install. The image provided here requires at least a 1TB disk.

  1. Download the default SteamOS beta installation
  2. Format a 4GB or larger USB stick with the FAT32 filesystem. Use "SYSRESTORE" as the partition name.
  3. Unzip the contents of SYSRESTORE.zip to this USB stick to create the System Restore USB stick.
  4. Put the System Restore USB stick in your target machine. Boot your machine and tell the BIOS to boot off the stick. (usually something like F8, F11 or F12 will bring up the BIOS boot menu).
  5. Make sure you select the UEFI entry, it may look something like "UEFI: Patriot Memory PMAP". If there is no UEFI entry, you may need to enable UEFI support in your BIOS setup.
  6. Select "Restore Entire Disk" from the GRUB menu.
  7. When it is complete it will shutdown. Power on the machine to boot into your freshly re-imaged SteamOS.
If you would like to customize your install a bit more, use the Debian installer:

Custom Install
  1. Download the custom SteamOS beta installation
  2. Unzip the SteamOS.zip file to a blank, FAT32-formatted USB stick.
  3. Put the USB stick in your target machine. Boot your machine and tell the BIOS to boot off the stick. (usually something like F8, F11, or F12 will bring up the BIOS boot menu).
  4. Make sure you select the UEFI entry, it may look something like "UEFI: Patriot Memory PMAP". If there is no UEFI entry, you may need to enable UEFI support in your BIOS setup.
  5. Selected "Automated install" from the menu.
  6. The rest of the installation is unattended and will repartition the drive and install SteamOS.
  7. After installation is complete, log onto the resulting system (using the Gnome session) with the predefined "steam" account. The password is "steam". Run steam, accept the EULA, and let it bootstrap. Logoff the steam account.
  8. Log on with the "desktop" account. The password is "desktop".
  9. From a terminal window, run ~/post_logon.sh. This will prompt for a password - enter "desktop". This script will perform the post-install customizations, delete itself, then reboot into the recovery partition capture utility.
  10. Confirm "y" to continue and the recovery partition will be created. When it is finished, reboot into your freshly installed SteamOS.

You can access to Steam repo to download Steam OS manually here.

If you have had a chance to try out Steam OS, leave your thoughts in the comments below!