Apparently it does by about 4%. Not quite sure how or why though.

Intel Core i5 3317U (Ivy Bridge) @ 1.7 GHz (turbo 2.4 GHz), Ubuntu 12.04

gcc 4.8, -march=core-avix-i -mavx
  Photon Time:      0 hours  0 minutes  2 seconds (2.558 seconds)
              using 7 thread(s) with 2.981 CPU-seconds total
  Radiosity Time:   No radiosity
  Trace Time:       0 hours  7 minutes 58 seconds (478.870 seconds)
              using 4 thread(s) with 1909.554 CPU-seconds total

gcc 4.8, -march=core-avx-i -msse2
  Photon Time:      0 hours  0 minutes  2 seconds (2.607 seconds)
              using 7 thread(s) with 3.055 CPU-seconds total
  Radiosity Time:   No radiosity
  Trace Time:       0 hours  8 minutes 18 seconds (498.217 seconds)
              using 4 thread(s) with 1986.597 CPU-seconds total

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