The Matroska Media container is a very popular, open standard Multimedia container which is usually found as .MKV files. It is a very popular format in enthusiast circles and can be played directly in VLC or Windows Media Player with suitable codecs installed.
We played our High Definition MKV movie using the latest version of VLC Media Player.
MKV playback is a simple task for the P8Z77-V LX2-based system. The lower result, in comparison to the competing Z77 motherboards, is likely due to a systematic error caused by the CPU usage measurement software, and therefore shouldn't be viewed as a meaningful advantage.