I am planning to upgrade my 2011 macbook pro to 8gb of ram in the near future. I don't want the extra memory to go to waste, so I'm wondering if it is compatible with my family's early 2009 2.66GHz core 2 duo imac. So far the only difference I can find is that the mbp has 1333mhz, PC3-10600 ram and the imac has 1066mhz, PC3-8500 ram. Will this ram just be limited by the hardware, but otherwise function normally? Or is the new ram completely incompatible? The imac currently has 2gb, so bumping that up to 4gb would be a nice improvement.