@John_Brock: Simply Rhino’s tests would tend to bear this out, though. Firstly, just on their baseline K4000 card, they compared V5 vs V6 using the Rhino Test Max Speed command when rotating and regenerating a large model; finding at least x8 speed improvement across a range of display modes (rendered, shaded, wireframe). So that’s an immediate software-based jump in performance, without introducing new hardware.
Then, when testing just in V6 and running Holomark comparisons, they concluded that “The entry level P400 card scores higher than a high end K4000 card from three years ago.”. When they tested the P1000 then P4000, of course there was a dramatic jump in performance.
It was my supposition, not theirs, that an i5 would be as good as an i7 cpu - if it is true that Rhino doesn’t use multithreading. But with an i7 cpu anyway, it does seem the V6 + P400 combo beats the V5 + K4000 combo.
Still, you’re probably right to be cautious, as a balance to me being provocative.