Hello there ! Probably this one was discussed before... if it was, I'm sorry. Recently I bought ASRock Z170 Extreme 4 with Intel i7-6700K. The issue I'm facing is when I want to put most of the voltages manually for 4.5GHz - Vcore using an Offset Mode (+55mv) + LLC3 = under full load of Prime95 v29.4, 1344K = 1.28v to 1.296v monitoring with HardwareInfo64 and HardwareMonitor, RAM voltage (1.35v) and using XMP Profile, DRAM Activating power (2.5v), VCCIO (0.950v), VCCSA (1.050v), PCH (1.0v), VCC PLL (1.2v) and Internal PLL Voltage to Auto, for 3+ hours - no errors, nothing. Same goes for 4.2GHz, when I was trying to put manual voltage 1.2v, which I know is the default. Rest of the configuration is: RAM G.Skill RipjawsV 3000MHz, CL15, 1.35v, Power Supply CoolerMaster GX 750, CPU Cooler CoolerMaster Hyper 212 EVO. I've been using this power supply for maybe 6 years now with i5-2500K 4.0 GHz, HD6850 Stock, and never had an issue with it. I upgraded just 3 weeks ago. But, when I'm playing GTA V my Computer suddenly restarts, but with no blue screen, just black screen, beep and ASRock logo - Loading windows ... Then after checking Reliability Monitor, using Windows 10 x64 1709, the only thing that I can read about the error is: Windows was not properly shutdown - nothing else. no clue about error code. My question is: My Vcore voltage is too low ? Or other voltages are not correct ? Probably power supply issue ? Thank you in advance !