Alright I purchased the x800 pro and I have noticed the entire time I have been using it I have gotten a lot of fps drops in counter-strike. Not random fps drops but drops like in spots where they would normally be. I had this same exact problem with my 9600 XT both on the same system. At first I thought it might be just settings and i messed around with them but no luck, and then I rolled back my direct X version from 9.0c to 9.0b because I am pretty sure I remember this happening when 9.0c was released.
------------------------------------------------------------
AMD 2700+
ASUS A7N8X E-Deluxe
Corsair TwinX XMS Ultral Low Latency 512 x2
2x Western Digital 36.7 gb 10,000 RPM Raptors
Western Digital 80 gb 7200 RPM
ATI Radeon x800 Pro
Ultra X-Connect 500W PSU
------------------------------------------------------------
AMD 2700+
ASUS A7N8X E-Deluxe
Corsair TwinX XMS Ultral Low Latency 512 x2
2x Western Digital 36.7 gb 10,000 RPM Raptors
Western Digital 80 gb 7200 RPM
ATI Radeon x800 Pro
Ultra X-Connect 500W PSU