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.
These results are very good indeed, with the MKV playback barely stressing the CPU at all.
ASUS do some great gaminmg machines too, and they cost a lot less than Alienware, but at least Alienware put a lot of effort into the looks as well, which is important.
Great machine, I own one, been using it now for gaming for a month. runs a bit hot on my knee, so I use it more on a desk.
The problem with Alienware laptops, of which I have had many, is the hinges wear out so soon. If anything needs replacing it is absurd at costs.