According to a Valve Engineer, the Steam Machine specs outclass the most common PC configurations. The company relied on its own hardware surveys to choose the system’s components. Even as an entry-level option, Valve claims that 4K/60 fps performance is realistic, despite a memory-limited GPU.
Yeah, that’s why I replaced the video card already. From what I’ve seen, the CPU is also doable if you’re careful but definitely a lot more fragile.