Dear Everybody, I am having an early 2009 mac mini in my disposal upgraded and running fine with 2GB RAM DDR3 8500S . EFI version is 1.2 up to date. The problem is that when I try to install 2x2GB GB RAM DDR 12800S , that a good friend gave me, I get a kernel panic screen. At first i thought that the modules are incompatible since 12800S is used on 2012 model.. but when I set 1GB RAM DDR3 8500S + 2GB GB RAM DDR 12800S it seems to work properly counting 3GB total... Is there a possibility that I could use the whole 4GB of 12800S type? Thank you in advance.. Good night and good luck!