Yup, I finally wore my freind down, and he brought not only the ATI Radeon 9800XT around for me to test, but a 9600XT as well.
He had already benchmarked the cards on his machine and his son's as well. Both were AMD system's slightly higher in spec than mine. We achieved better scores on my PC for some reason.
My spec: XP2600+ t/bred CPU, 1024mb PC2700 DDR, 333mhz FSB speed.
We formatted a Hard Drive, set up a fresh Win XP installation, tweaked XP a little to my liking and away we went!
The Radeon's were set up the same with the driver.
The GF4 TI4200 was set at the nearest equivalent Nvidia settings.
Catalyst 4.2 drivers for Radeon cards,
Forceware 53.06 drivers for the GF4 TI4200
In 3D Mark 2001, quality settings, Antialiasing and Anisotropic filtering off, 1024x768x32 res.
9800XT = 15,746 marks
9600XT = 11,238 marks
TI4200 = 11,604 marks
In FS2004:
All the cards were used in the Seattle default flight with scattered cloud, full settings - less ground scenery shadows and water effects. Antialiasing and anisotropic filtering on, 1024x768x32
Frankly, the 9600XT, (tried first) was a little disappointing, not offering much more than my current GF4 TI4200. It was 1 or 2 FPS ahead of the TI4200 in flying around Seattle with some cloud, in some situations.
The R9600XT was 3 or 4 FPS better than the TI4200 in dense cloud, which makes it a clear winner there.
The R9800XT was pretty impressive, not by outstanding frame rates (from 20 fps to 45 fps), but by it's ability to clearly mipmap distant objects, (no more blurry distant textures!) and it's good performance in dense scenery and heavy cloud.
The 9800XT thrived on the higher settings and resolutions when we upped the anty. A very nice Video Card indeed.