Halo
Halo performance always seems to be very reflective of the trends seen in the 3DMark05 Pixel Shading test and it is no different in this case. With other factors coming into play besides Pixel Shading, the Sapphire X800 XL is very close to the 6800GT and clearly distances itself from the 6800.
Splinter Cell
Splinter Cell has the 6800GT on top with the Sapphire X800 XL trailing. Framerates remain pretty good all the cards throughout all resolutions.
X2: Rolling Demo
The Sapphire X800 XL manages to keep a slim lead over the 6800GT throughout the benchmark set. For all intents and purposes they are pretty much the same speed.