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Can a 2006 Mac Pro that can't go above Snow Leopard physically on the host run Mavericks with vmware Fusion virtually?

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I'm guessing you can, and here's why (from VirtualBox):

VirtualBox supports 64-bit guest operating systems, even on 32-bit host operating systems provided that the following conditions are met:

  1. You need a 64-bit processor with hardware virtualization support (see Section 10.3, “Hardware vs. software virtualization”).

  2. You must enable hardware virtualization for the particular VM for which you want 64-bit support; software virtualization is not supported for 64-bit VMs.

  3. If you want to use 64-bit guest support on a 32-bit host operating system, you must also select a 64-bit operating system for the particular VM. Since supporting 64 bits on 32-bit hosts incurs additional overhead, VirtualBox only enables this support upon explicit request.

VMWare Fusion says something similar (search the FAQ for "64-bit").

Assuming your Mac Pro is the 2.66 Quad Core, EveryMac confirms that your processor is 64-bit. Give it a try, hit the forums, and good luck!

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