Hi
Been running my new NUC D54250WYK to act as both Plex Media Server and XBMC client and I am really enjoying it, still busy customizing the lot.
I've installed 16GB DDR3 + 256GB Sandisk MSATA on mine running Windows 8.1 x64, using latest drivers throughout (including more recent Intel HD drivers from November 2013 pack) and as I was investigating issues re sleep I noticed some odd entries in Event Log stating that the CPU couldn't go to 100% speed due to firmware.
I am running Balanced mode power scheme and using some of the CPU ID tools to monitor CPU frequency I only ever see it hitting 2.2GHZ, never the 2.6GHZ.
I will come back and bring the exact event log message.
The NUC runs inside an AV cabinet and is completely unobstructed.