I use this motherboard as a core:
Core - Basement
NZXT Gamma Black Case - 580 Watt Green 80 power supply
Asus M3A78-EM Mother board
1x AMD X2 5000+ Dual core 2.6GHz
2G RAM - OCZ
1x LiteOn DVD-CDRW
1x Seagate 500GB SATA drive (OS Drive)
2x Western Digital 500GB SATA drive (media)
1x Hitachi 1TB SATA (media)
1x Seagate 2TB SATA (media)
I am currently using 10.04 and the ATI card onboard is what is hooked to the monitor in the server room.
Before that I was using a PCIe Nvidia Card I think the 8200 or sometthing. You do have to go into BIOS and set up the onboard devices to use the PCIe slot first.
Also, if you are using multiple drives like I am, make sure they are in the correct chained order in the BIOS hard drive setup screen. For some reason, if left to itself the BIOS will not assign the drives based on order of which SATA port it is plugged into. I even had my cables numbered 1 thru 5 using ports 1 thru 5, and it still shuffled them about. But if you go into the BIOS and identify them based on the order you want the system ( and therefore Grub) to see them, manually order the drives.
Currently with the almost latest 10.04 install DVD LMCE-1004-20120412224425879.iso, the ATI card is functioning well, but this server sits in a closet in my office, if you intend to use it for your main viewing as well as serving PC, keep using your Nvidia card.
p.s. If I get a chance this evening, I will post the exact order the graphics choices need to be in, into this post.