If you hunt around for amithlon 1.3 you may have better luck. Someone hacked together (I think some guys from Turkey) an amithlon bootable iso that has partitioning software and other built-in stuff. Pretty neat.
I'm using the a8n-sli mobo, 1gb ram (2x512mb), realtek 8139 pci ethernet, sb128 sound, and a gtx7800 pcie nvidia gpu.
After installing the amithlon os3.9+bb1/2+updates bits from the CD, I can boot and am now able to use ethernet, sound, usb (had to get the newest version of poseidon and then reinstalled arakattack), and my gpu works very well. However, I can't tell if it's accelerated graphics or not - I try to attach settings to a board in p96 and the only board found is "vesa". Yet the graphics look great and are very fast. The only thing that's slow is scrolling text in a text document, web browser, etc.
It guru's on me pretty frequently, seemingly random. The only programs that work with sound are ones that use AHI. Paula doesn't work (maybe I'll try puhderbear or whatever it's called). It's a neat proof of concept but I'm not sure what to do with it now - setting up UAE in it seems like a bit of a chore and it's the only way to play games that hit hardware and custom chips. I guess we'll see.