[SOLVED] Overclock i7-7700k Vcore too high

[parmi93]

I built my desktop 5 years ago with this components:

• CPU: i7-7700k @ 4.20 GHz (Turbo boost: 4.5GHz) [delidded]
• Mobo: Asus Maximus IX Extreme
• GPU: Gigabyte - GTX 1080 Ti Waterforce WB Xtreme Edition 11G
• RAM: 32GB - G.Skill - Trident Z RGB - DDR4 3600Mhz - 32GB (8GBx4) - 16-16-16-36
• PSU: Seasonic - PRIME 850 W Titanium
• Custom Cooling system:
  • Radiator: x2 radiator (520x30x60mm)
  • Radiator FAN: x8 Noctua (120x120x15mm)
  • Pump: EK-XRES 140 Revo D5

Today i decided for the first time to overclock the CPU.
With Intel Extreme Tuning Utility, I was able to get the CPU to 4.9GHz with Core Voltage at 1.325V .

Spoiler: Intel Extreme Tuning

The system seems stable, I ran several stress tests with OCCT and passed them all without any errors, during the stress test the CPU temperature is around 75 °C.

But what worries me is that the Vcore is higher than what I have set, when the CPU is idle the Vcore oscillates between 1.360V and 1.376V, during the stress test the Vcore is around 1.344V .

Spoiler: HWiNFO64

at first I thought the HWiNFO64 voltage readings were wrong, so I measured the voltage with a multimeter (via motherboard test points), and I found that the HWiNFO64 Vcore readings are correct

Spoiler: Mobo test points

in idle I measured a Vcore of 1.37V during the stress test I measured about 1.355V.

Do I have to worry? why is there this discrepancy?
On several forums they suggest not to exceed 1.4V with an i7-7700k, I would like to try to push the CPU to 5GHz, but I am concerned that the Vcore can exceed 1.4V
Has anyone had a similar experience? any suggestions are appreciated!
Many thanks.

 

[Phaaze88]

Do I have to worry? why is there this discrepancy?

1)No.
2)Because of the cpu's integrated voltage droop mechanic plus the motherboard Load Line Calibration mechanic intended to counteract the former.

On several forums they suggest not to exceed 1.4V with an i7-7700k, I would like to try to push the CPU to 5GHz, but I am concerned that the Vcore can exceed 1.4V

https://www.tomshardware.com/features/inside-intels-secret-overclocking-lab/7
Take a read through the section, 'How to void your warranty as safely as possible'(or skip the first 6 paragraphs and start there, but I'd suggest reading the whole thing), from one of Intel's own engineers.
I can't imagine a more reputable source than that.