"Upgrading the internal components will not be as easy as compared to other platforms [...]," company general manager Frank Azor explained in a statement to Eurogamer, "but we will not prevent a customer from upgrading."
Azor cited the small physical size of Alienware's Steam Machine as a specific factor impeding hardware upgrades. Azor recommends that users who approach PC hardware with upgrading in mind should stick with pre-built setups like the Alienware X51. Previously, Azor implied that Alienware's Steam Machines hardware would not be moddable at all, noting that "this particular product is restricted in its upgrade options."
Alienware announced this week that new models of its Steam Machines hardware will be issued yearly as the company updates internal components and specifications. Alienware's first Steam Machine will launch in September.