everymac says this iMac takes 16GB of PC3-8500s. I installed 4x4gb PC3-12800s and it beeped at me. However, installing proved to be 4x4gb PC3-10600s was a success. I was a under the impression that PC3-12800s would clock down to 1067, so I tried it with only 2 modules (8GB) and it ran... But at least once a day, it would Kernel Panic and automatically restart. Swapping the modules, didn't help either. Any ideas why?