Instead of shipping top-of-the-line technology to each tester, Valve has opted to ship a variety of configurations. This allows the company a more accurate view of how Steam Box will perform in the hands of the public, as not every player will have access to the latest, greatest hardware. However, if you grow tired of how your Steam Box performs, Valve claims that each of these prototypes is fully upgradeable using relatively common components.
The 300 prototype units will ship with the following components:
GPU: some units with NVidia Titan, some GTX780, some GTX760, and some GTX660
CPU: some boxes with Intel : i7-4770, some i5-4570, and some i3
RAM: 16GB DDR3-1600 (CPU), 3GB DDR5 (GPU)
Storage: 1TB/8GB Hybrid SSHD
Power Supply: Internal 450w 80Plus Gold
Dimensions: approx. 12 x 12.4 x 2.9 in high