I know that I'm years behind as far us upgrading my computer so don't chew my head off, I have a Mid 2009 17 inch Macbook Pro 2.8 Ghz Core 2 Duo , 4Gb DDR3 Ram and Dual 9400 256 and 9600 GT 512. I planned on maxing out ram and installing a SSD, then I looked at the new system requirements for sierra and I'm immensely disappointed. My computer still runs circles around most of those 2010-11 machines. I know there is a work around but can someone explain Apples logic! is this because of their "Legacy" rule? I know my computer could easily squeeze out 2 more years even without upgrades and physically passes all the minimum system requirements except for model year.