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"Will POV-Ray render faster if I buy the latest and fastest 3D videocard?"
No.
3D-cards are not designed for raytracing. They read polygon meshes and then scanline-render them. Scanline rendering has very little, if anything, to do with raytracing. 3D-cards can't calculate typical features of raytracing as reflections etc. The algorithms used in 3D-cards have nothing to do with raytracing.
This means that you can't use a 3D-card to speed up raytracing (even if you wanted to do so). Raytracing makes lots of float number calculations, and this is very FPU-consuming. You will get much more speed with a very fast FPU than a 3D-card.
What raytracing does is actually this: Calculate 1 pixel color and (optionally) put it on the screen. You will get little benefit from a fast videocard since only individual pixels are drawn on screen.
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