yep, untrue. i did this in win 7 and still do in win8 and it works fine. i always set x264 (launched from MEGUI) and handbrake to "low" and could carry on with everything else just fine - including gaming. the x264 process just "ate" what was spare. if the other processes used 40% for a while then it used 60. usually it was limited to around 30 all the way down to 1,2% though.