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Some people do not have wrist cartilage anymore. Somehow Michael Larabel has already managed to install SteamOS, run several benchmarks across eight separate NVIDIA GPUs, and type five pages about the results. Remember your carpal-tunnel exercises!
Note that none of these benchmarks were using the Source engine. He briefly references two other articles to explain why before continuing on with the bar charts. The GeForce Titan and the GTX 780 Ti were the only two cards to push Unigine Heaven 4.0 past 60 FPS (mind you they almost reached 80 FPS).
He expects to release a second article, within the next couple of days, to compare SteamOS performance to other Linux distributions. He also discusses using the Steam Controller in another, already released, article.