I can't see the images, so not entirely sure hwich one is faster or slower...
But you should realize that it's not simply CPU clock speed, but number of cores. And it's not just PHYSICAL cores, but virtual/hyperthreaded cores as well.
My guess is that you have hyperthreading disabled on the the slower one. So you likely only have 4 threads running on that machine. Where as you have hyperthreading enabled on the faster machine giving you 8 render threads.
Just bring up task manager and see how many CPU bars show in Performance tab.
oh, sorry not sure what's wrong with pictures, I can see them (but maybe because I've added them).
on rx it shows:
workstation with i7-4790k 32gb ddr and quadro k5200: graphics - 9.7sec, processor - 27.3sec, I/O - 18.0sec, (Overall - 55.0sec), rendering 16.0sec, RealView - 18.1 sec.
my home desktop with i7-6700k 16gb ddr4 and gtx 960: graphics - 15.2sec, processor - 25.7sec, I/O - 16.0sec (Overall - 57.0sec), rendering 30.8sec, RealView - none as it's not quadro.
So I'm surprised why it's such a big difference in rendering results where it actually it's faster on processor and I/O and as far as I know GPU doesn't take any job in rendering in PhotoView 360.
Also I do have hyperthreading on it does show 8 processors.
Another strange thing is I was doing small render in work today so I took exactly the same file home, and actually it was faster. work was 13min42s, and home was 12min2s.
That's why I can't understand results from Rx Benchmarks. - I'm just curious.