I've the i5 3570K (Gigabyte Z77 D3H) at 4.5GHz, these are the settings I've changed and everything is at default,
CPU Clock Ratio: 45
X.M.P: Profile 1
PWM Phase Control: eXm Perf
VCore Voltage Response: Fast
VCore Loadline Calibration: Medium
CPU VCore: 1.210V (Normal)
Dynamic VCore (DVID): +0.020
Currently stress testing with Prime95 with these settings,
40 minutes and ongoing into stress testing and here's the result,
CPU-Z reports the Core Voltage under load is 1.332V max, and sometime changes to 1.320 and 1.308,
CPU Clock Ratio: 45
X.M.P: Profile 1
PWM Phase Control: eXm Perf
VCore Voltage Response: Fast
VCore Loadline Calibration: Medium
CPU VCore: 1.210V (Normal)
Dynamic VCore (DVID): +0.020
Currently stress testing with Prime95 with these settings,

40 minutes and ongoing into stress testing and here's the result,
CPU-Z reports the Core Voltage under load is 1.332V max, and sometime changes to 1.320 and 1.308,
