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 1080P MKV movie using the latest version of VLC Media Player and measured the CPU usage with the Performance Monitor built into Windows.
In this test we see a significant reduction in CPU usage with the 6800K which leaves more processor time available for other tasks.