Hi, I have a late 2012 iMac 27" with 2.9 GHz i5 processor an 8 GB of RAM. When researching for upgrading the RAM memory, I noticed the Apple store's RAM is 3 times more expensive as let's say the Crucial brand. I am confused. Is there a major difference in their relative performance or do the generic versions have compatibility issues?
TIA,
Sam
TIA,
Sam