I currently have a Nvidia GTX 770 2gb version. I was wanting to purchase the same card again and run them SLI, or maybe get the GTX 770 4gb version. Which option would give me better performance. The 4gb version only cost a few more then the 2gb version. I know the SLI that would mean more power consumption and heat, but since I do not have to pay the electrical bill, that would not be much of a factor to me.