So i have a late 2011 MacBook Pro 15" with the ATI Radeon 6770M card. Needless to say, it's getting a bit dated. I'm looking for something external at a low price if possible. I've been looking around and have seen that it can be possible and that some ATI cards are compatible right out of the box. I'm just sort of window shopping right now but any questions or suggestions would be great so i can get some sort of idea of what would be best.