(In reply to comment #9)
> On the following link, you can find my experiences of this issue on nouveau
> with a GTX760 card: 
> http://bugzilla.redhat.com/show_bug.cgi?id=1029224
> 
> Note that this bug only shows up when running high-end games on high
> graphics settings.
> Other games, like Xonotic don't exhibit this problem (even on high quality)
> and run very smooth (60-120fps). Nouveau seems to use the lowest clock
> speed: my GPU idle temp is 32 degrees Celcius and climbs to only maximum 35
> degrees Celcius on full load. (so I am quite pleased with nouveau: good
> performance for nearly no power consumption)

My issue happens with Xonotic too. I dont know why.