He can run at 1920x1080 with a mix of settings.
I do it on a ATI 4830, E8400 3.4GHZ and 2GB ram.
No worries, you can run all the games just with some setting tweaks depending on your resolution. Especially Mass Effect 1 and 2 will run very well. Farcry will also run very well. Crysis will not run overly well, but i think you can live with that.