Backwards compatiblity Geforce 200 series vs 9800

[jjim]

I'm looking at getting a new pc with a decent video card. I would prefer a new 200 series N260 or N280 card - but does anyone know how they run on xp with older games compared to the Nvidia 9 series cards. I currently have a core 2 duo with a 7950gt and have few problems with older games on xp sp2. Thx for any help.