I have a 21.5" iMac (Late 2009). Apple says that this can handle up to 8GB of RAM. They say that the 27" can handle more (up to 16GB). What happens if I install 16GB? Will it run? Crash? Use only part of it?
I finally called and chatted with Apple (simultaneously) and at first they said that the max is 8GB. After I showed them those documents, they agreed with me. the max is 16GB. (Thanks, Spiff.)