Carefully remove the heatsinks upward as the CPUs will be connected to the heatsinks as you remove them.Using the provided hex wrench to remove 4 or 8 screws (depending on having either a single core or dual core system) from the CPU heatsinks. The instructions provided state to keep the Mac plugged in. If you're already at 5,1 or have a 2010 - 2012 Mac Pro, you're good to go. If you have a 2009 Mac Pro, however, you need to first upgrade your 4,1 firmware to the 5,1 specification before swapping the CPUs. No tools other than what was provided with the kit was required.
