Does the 8 core have 16 threads or 8?

I'm a motion designer, I use Cinema 4D daily and I just recently put together an i7 PC strictly as a rendering node to use in conjunction with my main machine which is a quad 3GHz Mac Pro. The whole i7 machine cost just $1200 and it smokes the socks off my Quad 3GHz Mac Pro in every aspect (sad)... I bought the 2.26GHz version of the i7 and its completely stable overclocked at 3.7GHz on just air cooling. Now I know the i7 Nahelem is similar to the chips in the 8 core Mac Pro, but that the chip in the Mac Pro is a server edition of the Nahelem, correct? Anyhow, the i7 chip I bought is a 4 core chip, but to my surprise (which I didn't know when I bought it) is that the i7 actually has 2 threads per core, so the system sees the computer as having 8 logical processors, so when the machine renders in Cinema 4D, it actually renders like an 8 core machine, each frame is rendered in 8 parts simultaneously. Now my question is (since I don't have the new Mac Pro) is if the chip in the new Mac Pro has that same architecture, 2 threads per core, essentially giving the new Mac Pro a total of 16 threads? Does anyone know with any certainty wether this is the case or not? I'm going to be looking at moving my current Mac Pro as a render node and getting a new Mac Pro as my main work machine, but that would be really helpful to know beforehand.

Thanks in advance

Message was edited by: trackfive