I use older nvidia cards (not ancient ones) I think the xorg updates are causing major problems across many distros. Now with a newish video card 7900GT I can get nv304 working with xorg 1.12 (via antiXMepis MX14) but not with xorg 1.15 (sparky, xubuntu etc..) hope this helps, I keep filing xorg bugs maybe one will be considered & fixed.
For me this means no 3d support, no STEAM, no 3D gaming despite new motherboard combo.
hope this helps others.
edit: typos