It was a bit of a pain in the ass to get one, I didn't enjoy the black ops drop into Canada in the dead of night, covered in black paint, but the result was worth it.
Find it in full, here.R420 is what NV40 brought to the table in terms of performance, amplified, especially at its maximum AA mode. My 'ohmygod fast' exclamation on the second page really doesn't do X800 XT justice, it utterly obliterates anything that's gone before it when maximum respective AA modes are enabled, current 6800 Ultra included.
Then we come on to its form factor. You simply cannot ignore small PCB size, lower than 9800 XT power draw, no need for two power connectors, single slot cooler profile and cool running. You can run an X800 XT or PRO in a Shuttle XPC and that's all the confirmation you need of its excellent engineering.
It's impressive in every respect, from performance to form factor and image quality in between.
Rys