Re: DK8N, 6800GT & 4GB mem
No, I have not tried the vesa driver, but with NvAGP set to 0, the system seems to work fine. (Although the graphics are SLOW.) I also ran 3dmark2003 for 7 hours overnight last night and everything was still running fine this morning. So, Windows can do it. The drivers in Windows report AGP 8x SBA and FW enabled.
I suppose there could be a mainboard problem of some sort, but it only manifests itself under Linux.