iMac RAM: 16 GB or 20 GB
I'm running an iMac 3.4 GHz Intel quad core i7. I want to upgrade my RAM from the installed 4GB (2X2GB). The Applecare reps tell me that I can't configure beyond 16GB (4X4GB); that higher RAM will not be recognized or even cause a problem. The guy at the Apple dealer (Microcenter) tells me that I can install two 8 GB chips in two additional slots and leave the 2X2GB chips in place and have a total of 20 GBs of RAM. The dealer is not making more money that way. It would actually be less.
What's the right answer?