Alienware's Windows version of the Steam Machine that came out prior to the official launch. This machine is pretty capable at running your games that are compatible with Linux at 1080p quality. It contains some hardware that, can be argued, is better than the current gen consoles. It has some upgradability in certain parts like the RAM and storage. The big downside is that neither the motherboard nor the GPU can be upgraded since both are integrated together. Overall, it's a small form factor that can fit almost anywhere in your home and be sitting proudly next to your other consoles.
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Pro The R2 model
The Alpha had undergone a revision which was later called the R2. This version opened up the possibility to allow you to use Alienware's official Amplifier add on on that could handle desktop quality GPUs, like a GTX 1060, as a way of upgrading what you currently had in your system. It can breath more life into your Alpha. For some odd reason, it feels like when the Sega Genesis had undergone the CD and 32X add on in order to extend it's lifespan. But, with the Amplifier, it isn't attaching itself on top of or underneath the system like the Genesis add ons so it makes for a cleaner look.
Pro Windows OS
This machine launched before the Steam OS was released which means it is built on the Windows OS. This means all of the games available for Windows are able to be played on the machine. With Windows having a much larger amount of games available over Linux, which is what Steam OS is based on.
Con The R1 model
If you purchased the R1 model you're pretty much screwed in terms of upgrading, or amplifying, the GPU since this machine does not have an amplifier port for you to use the Alienware amplifier and be able to use something like a GTX 1080 or 1070 inside. There is one method that had been shared on youtube but it is a longer process than simply buying the R2 model and then buying the GPU of your choice and their Amplifier.
Con Some UI problems with the controller
Being that this is a Windows OS machine there are some parts of the UI such as the log in screen which are not optimal for controller support. It can be difficult to type in ones password when logging in.