On the Rhino forum there's a file you can run called Holomark2 that spits out a data sheet when it's complete showing all of the components of your computer and how well they performed with a total score at the top. Real useful. It's Rhino specific, not V-Ray specific but it nonetheless provides real valuable information. Would be great to have something like that here.
Encouraged me to think my next computer is going to be a i7-4790 w/ a GTX-970