Currently am running mid 2009 2.8 Ghz 15" MBP with a 500 GB HDD and 4 GB RAM. OS has been upgraded gradually thru all other iterations to Mavericks. Uses include usual office stuff; Medium photo and video manipulation; 2D CAD creation and 3D rendering viewing. I have started to get a little frustrated at the time it takes to perform certain tasks, especially in the CAD applications and some video editing. I am also wanting better compatibility with my iphone 6 and ipad mini that Yosemite apparently delivers. I have already ordered the 8 GB RAM kit as a start, and I am looking at the Samsung 500 GB 850 EVO SSD as a possible further option to improve speeds in some areas. My questions are: - Should I wait to upgrade to Yosemite until after the new Ram is installed? - Should I go ahead and order the SSD and install that before the Yosemite upgrade too? (I have found an affordable price for the SSD) Any other comments or shared experiences would be most welcome. Happy Easter!