Hi there, so I recently started looking at new laptops since mine is dying out and I found a decent one for sale. I am currently looking for one that I could do a bit of gaming on for when I travel and there are currently two models that I could get. One has a nvidia Geforce gt755m graphics card and the other has a gt750m graphics card. What is better? Also the laptop comes with an Ultrabay with the option for another gt750m Graphics card, will that work with a gt755m graphics card?