Just for your interest, here's the result of the Povray 3.7.0 benchmark on a
tiny ARM device:

CPU: Freescale i.MX6 Quad Cortex-A9 1.2GHz, 1MB L2-Cache, 2 GB RAM
(http://www.wandboard.org)

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Render Time:
  Photon Time:      0 hours  0 minutes 21 seconds (21.670 seconds)
              using 7 thread(s) with 24.824 CPU-seconds total
  Radiosity Time:   No radiosity
  Trace Time:       0 hours 43 minutes 32 seconds (2612.173 seconds)
              using 4 thread(s) with 10411.503 CPU-seconds total
                    CPU vs. elapsed time ratio: 3.986 !!!

It takes forever, but at a steady power consumption of about 5 Watts ;)
Btw. compilation of Povray took about 10 minutes with make -j4

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