Not stable because I've not taken enough time to tweek setting well enough. I'm working at designing a custom air conditioned box for the whole computer and just tried a quick couple of overclocks to see what might be possible. Prior to doing this, my normal setup would not get to 5GHz long enough to validate. So, 5.3GHz is possible, but not stable enough to do more the minor things like browse or play a netflix, or such.
Here's a couple of pics to give you an idea of what I'm doing.
Just done with the cell phone, so might need a bit of interpretation.
Pic 1 - Close up of the motherboard, and D-12.
Pic 2 - Whole case shot with the Noctura D-12 installed.
Pic 3 - Chilled air diverter into the H-80.
Pic 4 - Close up with the H80 installed - Note the chilled air inlet on the floor.
Pic 5 - Another inside case shot - Note the 5" exhaust port into the top of the AC box.