Both my Acer R1600 (1GB RAM) and R3610 (2 GB RAM) run windows 8.1 + WMC. They both do okay as WMC dedicated devices, waking from sleep up to record scheduled OTA HD. Their native 5400 RPM hard drives handle recording and playback of 1080p video well enough, but anything else requiring disk I/O is a major bottleneck. E.g. they are slow to boot, slow to shutdown, wake, sleep, etc. When unattended, this doesn't really matter. Will be upgrading at least one of them with SSD and 4GB RAM, expecting a noticeable performance boost, mostly from the SSD.