Mobile I would think. As its rare to have a full desktop card in a laptop due to power requirements and hear transfer.

If you have a look on CGtalk people were having problems with the 8000 series cards with viewport errors etc etc, I think it was on PCs as they those cards wernt available for macs at the time, thats how I know you might have problems and as your going to use fusion you might get them depending on the settings used.

I think that thre were a few posts related to the 8000 Series cards on here too.