So last night my iMac kernel panic'd 2 times in short order. Hoping it is caused by the RAM going bad, I removed the two 8 GB sticks from Crucial. Up to 6 PM tonight, the computer ran fine with no issues with the original 2x8 GB sticks from Apple. I put in one of the Crucial sticks( so a total of 24 GB currently) and so far again no issues. Probably tomorrow( or tonight before going to bed) I will swap the Crucial sticks to see if the other one is the bad one. Though usually how long do you go to see if RAM is causing the issue? Or should it cause a kernel panic pretty quickly if it is indeed bad RAM?