Just wanted to add that I've done lots of testing for video games at true 1080p60 and the only one that ever impressed me was x264vfw. The only thing that ever destroyed x264vfw in CPU usage was MagicYuv but then the data rates of MagicYuv were much higher. Additionally, the config you can do in x264vfw is just too strong. Don't need perfect frame seeking during editing? Turn down --keyint to something like 10 and enjoy 35-40% data rate reductions! It's monstrous.
More info:
http://www.thethrillness.com/2014/10...s-x264vfw.html