Now I can finally run visual effects in Ubuntu, and boy, is it sweet!! The pretty animations, the desktop cube - I love it. And it runs so smooth!! Aero just sucks in comparison.
Since the motherboard is quite new, I needed to do some tweaking to get it working properly.
sudo update-pciidsTo get the "lspci" list updated.
Install the nvidia graphics drivers manually to get the sound working.
For the sound, I followed these instructions posted on ubuntuforums.
The Ethernet card uses the "forcedeth" driver, which has a strange bug that caused the MAC address to change on every boot. I couldn't live with that, since I configure my wireless router based on the MAC. I decided to use my old Ethernet card for the time being.