COD is usually rendered @ 620p or 720p (exclusives can manage 1080p) and upscaled to 1080 @30fps with no AA.
If you where to build a rig thats similar priced to a console (CPU,Mobo,ram,GPU,PSU,Case,HDD etc no tv/monitor since you would have to include that in the price of a console too) you looking at possibly 9800gt, HD4770 priced GPU which manages most games @ 1080p with 8AA in some cases with over 30fps. Obviously it depends on the game and you can scale AA and settings back to get higher frames but atm a similar priced PC should out perform a console easily plus do more too.
Your looking at struggling with just over 2m pixels on consoles (1080p on a good day), PC's with eyefinity are managing 3 x 30" monitors. Thats 12m pixels. Guess you could say 6 times by very basic maths.