Recently I've been cursing over the CPU's bottlenecking everything I do. I'm stuck with the 2009 Mac pro, 2.26 8 Core. For about a year I've been looking in to manually upgrading the processors. I've been looking at the W5590's, which I think at some site they offer as a mac pro upgrade. I've also been thinking about the X5680's, since I heard the 2010 Mac Pro Mobo is identical physically to the 2009, but i've been hesitant to go for those, as supposedly the microcode is different (And I don't know how to deal with that... Has anyone managed to find a way around that yet?) I'm curious what steps to take, and what precautions to look for, and above all, which and what to go for. One site mentioned an issue caused by the Integrated heat spreader... Should I worry about that?