Heaven 4 benchmarks on cMP with Mavericks

[ssls6]

I'm curious what other people are getting with Mavericks on this particular benchmark.

First my machine is a Mac Pro 5,1 3.33Ghz Hex with Mac Edition GTX680. I am running the extreme preset Heaven 4 benchmark (1600x900 8xAA windowed), Cuda 5.47, Stock OSX drivers

With Mountain Lion 10.8.5 I get the following
FPS 54.8
Score 1380
Min/Max 9.5 99.4

With all versions of Mavericks I've tested (10.9.0, 9.1, 9.2)
FPS 38.0
Score 957
Min/Max 7.6 94.5

What I don't understand is why Mavericks is so much slower for the average FPS versus Mountain Lion. If anyone has a similar system and Mavericks, it would be a help to me to compare scores. Is Mountain Lion just faster or Mavericks just slow on my system?

 

[666sheep]

Tesselation. Extreme preset has it set to maximum in 10.9. 10.8.5 does not support it due to lower OpenGL version, and it's disabled in Heaven under this OS, hence higher scores.

 

[ssls6]

Tesselation. Extreme preset has it set to maximum in 10.9. 10.8.5 does not support it due to lower OpenGL version, and it's disabled in Heaven under this OS, hence higher scores.

Thanks, I knew something had to be up.