Minecraft is usually somewhat difficult to run so You may be able to get around those frames. Counter strike you can get 40-60 fps on ultra. And around 80 on high. L4D2 I can't get benches on but might be around 40 on ultra. If you play these games above 1366x766 you're not going to be able to play on ultra.
thanks, i will play on 1440*900 so i think i am ok.
i read somewhere that iris pro only meets the minimum requirement for csgo so i was a bit worried.