The winner usually is the x1900xtx

From anandtech
Oblivion

Battlefield 2

Black and White

Fear

Half Life 2 Ep. 1

Quake 4

Splinter Cell Chaos Theory

This is mostly a comparison of the higher end cards but it looks like ATIs 1900xtx edges out Nvidias most the time unless you have 2 nvidias in sli.
Sorry rom.

http://www.anandtech.com/video/showdoc.aspx?i=2833&p=8