you think this would run crysis on high in 1600x1200 no AA?

8800gts640mb, intel core q6600 quad core, 2 gigs of 800mhz ddr2 ram

my machine performes good with many games(fear, sc.double agent, stalker, battlefield 2142 and more) on medium settings in 1280x960.

would another 7900gt bless me with high setting,1920x1200 resolution and 4xAA possibilies?

...and is it possible for me to mix a 7900gt256mb with a 7900gt512mb?

does it have to be the same manufactorer?

my specs:

amd 3800+ 64bit

asrock sli mobo

2 gigs of 400mhz ddr1 ram

7900gt 256mb

370w powersupply (will be getting a 600w if I get the other 7900)

can I use a lcd pc monitor for my 360/ps3?

what connection do I need on the monitor?