the ultrabooks with the nvidia 900 gpus are the only near choice to do it, reason for this, temperatures, but I would think the CPU would throttle first on this, does it need to be an ultrabook though, and not just a standard laptop, they will have the nvidia 900 series gpus in as well and less chance to throttle under gaming where the cpu will get taxed.

But thats really the only choice at this stage, dunno when they are out, might need a shop around your part of the world for it.