I'm having trouble getting it stable at 5.9 all core. It keeps downclocking to 5.6. Intel Adaptive Boost Technology - DisabledAsus Multcore Enhancement - Disabled Enforce All LimitsSVID Behavior - TrainedPerformance Core Ratio - Sync all cores at 59S...

I too picked up a 14900ks from Microcenter yesterday morning. Will also be putting it into an Apex Encore in the next week or two. Looking forward to hearing more about your experience with the combo.