It should do 144hz for desktop use but for games im unsure what it will be like. As of course it wont run 144hz v-sync in games unless your rig is powerful enough. so i dont know if it will give screen tearing or not at such high refresh rate.
very nice monitor though! will be incredibly smooth.
Depends what games you play. A single gtx 980 would just about do 144hz on 1080 maxed settings on battlefield 4.
yeah it should be fine, it will still be nice and smooth as it will be over 60hz regardless so i wouldnt worry about it, put it this way it uses similar power to 4k at 30hz so it still will be a much nicer smoother experience than 4k at 60hz especially on games.
That's why I recommended QHD.