So what your saying is a 2699 v3 might be faster than dual x5690's? Not the case.
The multicore score gives you a relatively good idea where you stand. Not definitive any any way but a guide.
As dual x5690's and a 2697v2 score quite close and actually render in vray a fraction apart.
A OC 6700k renders quite close to a 1650v2, Guess what there only separated by a small margin.
Nothing beats real world though.
I understand where your coming from but numbers speak and geekbench and vray also do.