Found some interesting data - as we know 8800GT is slightly faster than 3870 without AA or with 4x AA, but barely anyone tested with higher antialiasing. Extensive german review about it: http://www.computerbase.de/artikel/hardware/grafikkarten/2007/test_ati_radeon_hd_3870/13/
In higher AA modes 3870 pretty much always wins over 8800GT, sometimes with wide margin. Why nobody has noticed this before? Probably because its assumed fps will be too low to be useful, but thing is - diference from 0 AA to 4x is much bigger than 4 to 8x. Also SLI/CrossFire shouldnt be ignored too, its the future for both firms in dual cards setups or in dual-core chip cards.
In higher AA modes 3870 pretty much always wins over 8800GT, sometimes with wide margin. Why nobody has noticed this before? Probably because its assumed fps will be too low to be useful, but thing is - diference from 0 AA to 4x is much bigger than 4 to 8x. Also SLI/CrossFire shouldnt be ignored too, its the future for both firms in dual cards setups or in dual-core chip cards.