Now I'm wondering just what algorithms a 3D card does have that makes it 
'impossible' to be used to raytrace...
...or it it merely 'utterly impractical'?
After all, you can do calculations to arbitrary precision the hard way, 
it just isn't very fast compared to using inbuilt FPU abilities, and 
reduces the 'using 3D card to increase rendering speed' to an absurdity, 
but not an impossibility.  If the 3D card is able to calculate even one 
pixel in the time it takes the rest of the scene to be rendered 
normally, it technically has sped up the total render speed.

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