ATI Radeon videocard problems (probably)

[Kristian2]

hello all,

not so long ago I bought SHIII, but I have had trouble with it since. When I run the game it hangs shortly after loading, I tried several drivers for my videocard, an Ati Radeon 9600XT (my hardware fulfills the recommended specs), didn't resolve it or made it worse. In the best case the game works for about 10-15 minutes (or longer depending on the mission) with the Ati drivers that come with XP (SP1).
I haven't found an answer so far on another forum and the Ubisoft helpcenter hasn't provided an answer either. My best guess is that my videocard simply doesn't work with this game. Everything else, including a non-Ubisoft game, does work without problems (except MS Train Simulator which also stalls, and is a Ubisoft game as well).
I am thinking of buying a Radeon 9800Pro, or better perhaps an nvidia card (AGP 8x).
My question is does anyone know that this videocard (Radeon 9600) is giving trouble.

And anticipating on the 'Grey Wolves' mod, after I get this game running, is a videocard with 256MB a bit overkill compared to a mere 128 MB?

Thanks,
Kristian