So I know there was another thread in here just know talking about upgrade possibilities and I saw something that struck my eye, and I felt it deserved its own thread. Does the single Quad Core version of the 2009 Mac Pro have heat spreaders on the chip? I understand one of the reasons its so hard to upgrade is because Mac Pro Xeons dont have heat spreaders, but apparently this only applies to the Octo-core version? Anyone with the knowledge care to help me out? I'd love to be able to upgrade my 2.66 to a 3.33 W3580.