Oki now i'm really baffled JWH, as I have a
P2 266mhz | 256Mb Ram | Savage4 Pro 32Mb (AGP)
althought a little sluggish, the demos all worked
As far as the C++ 3D is conserned, technically C++ itself doesn't use enhanced 3D - however processors now oftenly have MMX, SSL, SSL2, 3D Now!, PowerNow! builtin which specifically help with 3D Software/Reference Rendering.
However if DBpro has been coded completely within DirectX without taking note to the processors abilities or speed then C++ will be using the bare minimum of your processors, so in the case of DBpro your graphics chip would be FAR more important than the processor.
As a development language, it should be taking advantage of the entire power at its disposal.
"For the Greater Good"...
Kyi'Aun (Jedi Master) Rai'Ka