Wow good question. I know that the AGP card will work with the 64 bit Athlons but actually running 64bit instead of 32bit I really dunno but Id bet it only runs 32bit right now. May wanna bring that up with ATI support.
Mobile Barton 2500+ @ 2420mhz 11x220 1.7v
Asus A7N8X Dlx 440 FSB
1gb Geil GD pc3500 Dual Channel (2-3-3-6)
Segata 80gb SATA 8.5ms seek
ATI Radeon 9800 Pro to XT(420/730)