Too low vCore, IMO. VTT is probably more then enough for that UnCore speed, but it's not easy to run CPU @ 4.5GHz.
Thanks, will try increasing Vcore and lowering VTT

A couple of questions,
IOH Voltage, what is the safe operating limits for this? 24/7

What is the consensus regarding these 4 options, that may be beneficial to overclocking?
CPU Differential Amplitude [Auto]
CPU Clock Skew [Auto]
IOH Clock Skew [Auto]
CPU PWM Frequency [Auto]