Also the article mentions Optimus, but I don't think the Steam Box will use that, because: Optimus is now only used in laptops because of battery life. Small-sized desktop systems and thin all-in-ones, do not have Optimus even if they are using an NVIDIA mobile GPU. It does not improve battery life in devices that have no battery, and it won't magically make the device much cooler; the cooling system needs to be able to cool the NVIDIA GPU at full load anyway so it's certainly powerful enough to keep an NVIDIA GPU cool in its lowest level.
No announcement yet.
Hardware Expectations For Valve's Steam Box