Has anyone that know if it's possible to upgrade MacPro Nehalem 2.26 to 2.66 Ghz Westmare with the following processors : Intel Hexa Core Xeon® Processor X5650 12M Cache, 2.66 GHz, 6.40 GT/s Intel® QPI part #:BX80614X5650 ? Could you help me telling if its possible to upgrading MacPro Nehalem octa core 2.26 Ghz to Mac Pro Westmare hexa core 2.66 Ghz ?