Get used to running games on low settings all around. I did this with my macbook air. you could probably run Counter strike source pretty fine though.
OP has a 15" MacBook with the HD4K, which also means the discrete 650M (presumably with 512MB VRAM).
The 650M is a very capable GPU. Just Cause 2, GTA IV, Batman AA, AC2 have been running at 1920x1080 and mostly maxed settings, apart from Anti Aliasing which doesn't have a good benefit:resource usage ratio IMO (rather the extra FPS over smoothing), plugged into my TV. Portal 2 actually runs smoothly at 2880x1800 on the laptop screen. However mine has the 1GB 650M. I couldn't tell you how it compares to a 512, but it won't be a massive difference. Are you looking to play games in OSX or Windows via Bootcamp?
I'm confused. If you have a 15" MBP, then you have a discrete NVidia GPU....not only the HD4000. Which means you can play any game available. You just have to install windows.
Nah I know but I wanted to make sure I wouldn't get a game that would require more pixels then my computer could hold, and if the game would lag/crash
I was playing some X-Men Legends on my Gamecube the other night, imagine how I feel...
What do you mean by "require more pixels"? If you have a standard 15" MBP, you've got a 1440x900 display there which is a very normal size to have. Particularly old games might be made for lower resolutions but I can't imagine a situation where you'd need more pixels than your display offers for gaming. Indeed, the lower the resolution you play the game at, the higher your FPS will be in general.
I mean how would I know what games to stay away from cause they work on retina books, if there is any. It sounds like I can play any game, just will need to change quality on some. I'm just making sure
Thanks for the great answer.......also I will be mostly playing on OSX, but what would you say about Windows and bootcamp