Answer to: Will RAM from MacBook Pro (Mid 2009) work in the 27" iMac (Late 2009)?I just installed 10min ago, 2 modules de 1GB coming from my Macbook Pro 2009 unibody with PC8500, 1066 DDR3 into the 2 empty slots of my imac 27". Now all four slots are filled and the iMac has 6GB. OSX recognize it without any problems. Tested with TechTool Pro 5.0 zero problems. It looks that configuration is going to work. Enjoy. Happy new year to all out there.