Im getting ready to purchase my first Apple Computer. I am getting the 27" iMac and wanted to know what is your idea about the 775M 2GB and 780M 4GB. I want to know if you think its worth the upgrade. I sorta am looking for something future proof. Im a YouTube Partner so I want to play some indie games and maybe a few AAA titles. I want to play games like DayZ, 7 Days to Die, TF2, and maybe some Battlefield (rarely). Most of the games will be indie games. I am using my Xbox One and 360 for major games. I'll also be doing alot of video editing and using PhotoShop so I already decided on getting the Intel i7 and also a 1TB Fusion Drive. I looked at a chart that showed 2GB and 4GB comparison (I'm sure it wasn't with these actual cards but the memory they have) They played major games and in all of them they performed the same except one where it failed bad but because it was connected to 3 monitors which I'm not doing. Let me know what you think or let me know if there is an actual difference!