I just got the 7800GS to install. After running Aquamark on standard benchmark. I did have some troubles with Nvidia driver install. I ran the ATI benchmarks first since that was the card I was replacing. I ran the ATI removal tool off their site, shut down. Put 7800GS, tried latest drivers for MCE2005 off Nvidia's site and got a error stating could not find proper driver. Then I ran the driver install off the BFG disc and finally installed. The driver under device manager states driver : 8.1.9.8 12/10/05. Not sure if it was the MCE driver though but it did finish install without any errors. I am not a expert benchmark person, I am just a above average PC user that tried to compare Apples to Apples. Hopefully new drivers or other reviews will show the 7800GS outperforming since the 7800GS is what I am keeping for my new Media Center.
7800GS : Standard Benchmark at 1024x768 AA off AF 4x
GFX score: 9580
CPU score:8761
AquaMark score:61942
X850XT : Standard Benchmark at 1024x768 AA off AF 4x
GFX score: 10107
CPU score:8853
AquaMark score:64358
7800GS : 1280x1024 4xAA/8xAF (Pro Mode)
Average FPS : 52.5461
X850XT : 1280x1024 4xAA/8xAF (Pro Mode)
Average FPS : 59.3499
7800GS : Standard Benchmark at 1024x768 AA off AF 4x
GFX score: 9580
CPU score:8761
AquaMark score:61942
X850XT : Standard Benchmark at 1024x768 AA off AF 4x
GFX score: 10107
CPU score:8853
AquaMark score:64358
7800GS : 1280x1024 4xAA/8xAF (Pro Mode)
Average FPS : 52.5461
X850XT : 1280x1024 4xAA/8xAF (Pro Mode)
Average FPS : 59.3499