Hello guys, Just upgrade my iMac 27"Late 2013 with 4 X KTA-MB1600L/8G, Yes, kernel panic every day. Just check with Kingston and its disty, 1. If your KTA-MB1600L is with Micron chip, it is ok 2. If your KTA-MB1600L is with Kingston chip, it's fail Solution: No solution in this stage, Kingston would provide you 100% refund. FYR.