So you’re running the test on basically 2 identical systems… why would you expect it to be faster? The speed is in the GHZ, not in the model of the chip. Also just a side note you should probably get more RAM. Mac Pro’s are capable of 64GB, there is absolutely no good reason you shouldn’t be taking advantage of that, esp if using for high-end graphics.
Your new mac pro should offer significant speed increases while working within Cinema too, due to the graphics card (depending on which one you opted for). I have a maxed-out cylinder at work, and that thing flies