Hey. laptop/notebook dedicated graphics cards are solderd on their motherboard, meaning there is no way to change it, and also the whole notebook designed for a type of card, this means the board has thermal limits etc. if you have an ultrabay for sli, you can change the ultrabay card but you won't gain anything because you can't sli 2 different cards.
I'd suggest to sell your laptop for as much as you can, and build a gaming desktop pc if you want to enjoy 2014-15 and upcoming AAA games on high quality 1080p or higher resolution.