Hello, i have a 2x2.26 2009 mac pro that i am seriously considering upgrading to hexs after the firmware hack was released allowing 2009 units to take them. I know about the difficulties in upping a dual cpu unit, but am still thinking about doing it. I know phil has put together a truly outstanding guide for the single cpu machine, but was wondering if there was a similar guide (preferably with pictures) for the dual cpu machines. I read about heatsink modifications and want to see what that looks like and what goes into it before purchasing the costly cpus. Thanks for any replies, and for all your help!