Problem with Maya Mental Ray with new 8 core

I am having difficulties with my new mac pro 2009. Mental Ray for Maya is limited to 8 threads (cores normally) but with hyperthreading these 8 threads don't get distributed to each of the 8 cores and instead get split up among the 16 virtual cores that hyperthreading creates. This means rendering is significantly less efficient than it might be. There needs to be a way to turn off hyperthreading (either that or Autodesk need to sort it out within Maya)

please see this thread for more info about my problem: http://forums.macrumors.com/showthread.php?t=665155
Yes it really is causing a lot of hassle and is a bit daft that I can have 8 threads running, 6 of which all group together on 3 physical cores and only 2 threads having their own cores. DAFT.

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