I tried from -15c to -90c I didnt notice any codes when it says OC failed.
It does a OC fail once every boot cycle maybe twice but then will boot with same settings run fine then. That can happen even on a 4200mhz overclock too not just max clock.
These are my max air settings
104 bclock
54x
vcore 1.57
vccsaio 1.11875 vccsa an vccio are tied together on the z as far ad I read. ???
Dram 1.65
cpu pll 1.8125
Here is a bios shot of the Digi VRM/Power tab are these rite?
The rest of my settings
Tried auto on skew driving voltages to