There is no such thing as a 2009 MBPr, as the retina model was first released in 2012. You can't add or replace RAM in the MBPr at all, as it's soldered in. You may be able, however, to use RAM from an iMac in a MBPc.If I bought 32GB for my new 27" Imac can I re use the existing 8GB of memory in a 2009 15" MBPr?
MBP means "MacBook Pro". Your 2009 MBP uses 1066 MHz DDR3 SDRAM (PC3-8500). Your 2012 iMac uses 1600 MHz DDR3L SDRAM (PC3-12800). I'm not certain they're fully compatible. I prefer to use only the exact spec that was originally installed.I thought the "r" MBPr was for pro. Not Retina. Sorry. I have a 2009 Macbook Pro.
The chances of it working are between slim and none. And slim was last seen on his horse heading out of town....
4GB (two 2GB SO-DIMMs) of 1066MHz DDR3 memory; two SO-DIMM slots support up to 8GB
8GB 1600MHz DDR3 SDRAM - 2x4GB Is what is in Imac?
Would this work?