Any graphics card made in the past decade is leagues above what's required for (even the recently constricted) p99. If the native client doesn't show your graphics card in the ALT+O > display > advanced field then use
dgVoodoo2 and it should use it. There's an ini to edit (or an exe you can use to do so) where you can tweak your settings. For my regular config (laptop with gtx 980m) the defaults worked flawlessly. Note: I play in windowed mode so I can look stuff up, and watch streaming video whilst medding.
-Mcoy