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

I think you can go straight to the horse's mouth, Intel, along with Wikipedia has a lot to say.
People have used eVGA Classified and Xeon W35xx to go beyond 5GHz, thanks to the quality of server chip.
Intel Core i7 920 2.66GHz 8M L3 Cache 4.8GT/sec QPI Hyper-Threading Turbo Boost LGA1366 Processor
Not every program runs at its best with HT enabled, but some do better.
Even last year's 2.8GHz 8-core still selling for $2399 has a lot of power behind it.
As for $1200, that is cutting it close, depending on what you already have on hand, and such, but a good board, and add'l copper and fans or water, 4GHz is entirely doable with D0 steppping.
There are plenty of threads, here, this forum, and elsewhere reviewing and talking about Mac Pro Nehalem performance.

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