My $749 test unit costs a pretty penny more than the highest-priced console on the market, but it has a lot to offer. The flagship Alienware Steam Machine packs in a Core i7-4785T CPU, 8GB DDR3 memory, a 1TB 7,200 rpm hard drive and a customized NVIDIA GTX 860M graphics chip with 2GB of video RAM. That turned out to be enough power to run almost everything in my SteamOS-compatible library on high visual settings at a decent frame rate.
Most games automatically configured themselves to medium visual settings by default, hovering at 45 frames per second or higher, depending on the title, but I found the system could push most of them a little further. Borderlands: The Pre-Sequel happily bounced between 35 and 50 fps (depending on how much action was on screen) on maximum visual settings, and both Shadow Warrior and Spec Ops: The Line eclipsed 50 fps with the dials turned to 11. BioShock Infinite dipped just below 30 fps on Ultra, but maintained a solid 40 average when tuned down to "very high" settings. I had similar results with Serious Sam 3, finding Ultra to be just a tad too much, but High ran just fine. It should be no surprise that Valve's own games also ran great on the first official Steam Machine: Left 4 Dead 2 and Portal 2 had no problem hitting 60 fps on their highest visual settings
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Even The Witcher 2, one of my library's heavier hitters, ran moderately well, managing to stay above 30 fps on high settings and comfortably hitting the 40s on medium. Simpler offerings like Civilization: Beyond Earth had no trouble hitting playable frame rates on maximum settings, and the machine also shrugged off the plethora of indie titles available for SteamOS + Linux.
The games that ran poorly surprised me: Shadow of Mordor struggled to hit playable frame rates at my television's native 1080p resolution until I dialed back its graphics options to their lowest settings. I don't know if the game is simply more resource-intensive than I realized, if it's poorly optimized for PCs or if it's just a bad Linux port.