http://www.firingsquad.com/hardware/nvidia_geforce_8800_preview/
Half life 2 Lost Coast HDR 1920x1200x32 4xAA 16xAF
$650 8800GTX : 98.7
$450 8800GTS : 76.1
$400 X1950XTX : 53.7
$300 X1900XT : 49.5
Dark Messiah HDR 1920x1200x32 4xAA 16xAF
$650 8800GTX : 101
$450 8800GTS : 72
$400 X1950XTX : 49.4
$300 X1900XT : 45.6
BF2142 1920x1200x32 4xAA 16xAF
$650 8800GTX : 77
$450 8800GTS : 51.1
$400 X1950XTX : 46.3
$300 X1900XT : 41.4
Quake 4 Ultra Quality 1920x1200x32 4xAA 16xAF
$650 8800GTX : 83.6
$450 8800GTS : 63.7
$400 X1950XTX : 48.7
$300 X1900XT : 43.2
Lock On: Mordern Air Combat 1920x1200x32 4xAA 16xAF
$650 8800GTX : 83.3
$450 8800GTS : 68.7
$400 X1950XTX : 48.7
$300 X1900XT : 42.9
Pacific Fighter 1920x1200x32 4xAA 16xAF
$650 8800GTX : 55.6
$450 8800GTS : 51.9
$400 X1950XTX : 42.8
$300 X1900XT : 39.5
FEAR 1920x1200x32 4xAA 16xAF
$650 8800GTX : 69
$450 8800GTS : 50
$400 X1950XTX : 49
$300 X1900XT : 44
Oblivion Mountains HDR 1920x1200x32 0xAA 8xAF
$650 8800GTX : 101
$450 8800GTS : 79.8
$400 X1950XTX : 45.4
$300 X1900XT : 42.1
Oblivion Foliage Area HDR 1920x1200x32 0xAA 8xAF
$650 8800GTX : 52.7
$450 8800GTS : 38.6
$400 X1950XTX : 26.7
$300 X1900XT : 24.5
Oblivion HDR Mountain Area 1920x1200x32 4xAA 8xAF
$650 8800GTX : 70.5
$450 8800GTS : 46.5
$400 X1950XTX : 34
$300 X1900XT : 29.8
Oblivion HDR Foliage Area HDR 1920x1200x32 4xAA 8xAF
$650 8800GTX : 38.3
$450 8800GTS : 26.5
$400 X1950XTX : 23
$300 X1900XT : 20.6
Call of duty 2 1920x1200x32 4xAA 16xAF
$650 8800GTX : 55.6
$450 8800GTS : 41.3
$400 X1950XTX : 41.1
$300 X1900XT : 35.3
Farcry HDR 1920x1200x32 4xAA 16xAF
$650 8800GTX : 88.1
$450 8800GTS : 63
$400 X1950XTX : 48.7
$300 X1900XT : 43.1
Company of Heroes 1920x1200x32 4xAA 16xAF
$650 8800GTX : 70.8
$450 8800GTS : 57
$400 X1950XTX : 36.4
$300 X1900XT : 33.3
As you can see X1900XTX can do 30FPS average @ 1920x1200 with most games but if you wanted a solid 60FPS ++ in almost every game than G80 is the way to go.