DELL M3800 4K display browser problems chrome,firefox and mozila video playback problems

i just bought a DELL M3800 workstation laptop with a 4k display.

My problem is when i try to play a video on YouTube, vimeo, .... the audio and video is not synced and the video stutters.
With internet explorer it works perfect.

i updated al my drivers, windows 8.1 and flashplayer ...

any of you guys have any idees ?