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MSI Z87-G45 & i5-4670K - VCore setting ignored. Set to 1.147V but reported as 1.3V

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  • Overclocking
  • BIOS
Last response: in Overclocking
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September 25, 2014 2:21:16 AM

Hi guys, OC newbie here. Using an i5-4670K, I previously had a 4.1GHz overclock with 1.147V (1.195V w/ -0.049 offset, adaptive mode) stable for over a year. All other settings were at default.

I reinstalled windows 3 weeks ago, updated the BIOS from 1.8 to 1.9 and the ME drivers. I didn't touch the overclock settings afterwards due to studies, but when I did try a few days ago, the vcore setting I enter in the BIOS seems to be ignored. Using the same settings as before the reinstall (1.195vcore, -0.049 offset, adaptive mode), it is reported by CPU-Z to be 1.28 - 1.3V during a Prime95 stresstest.

What I've tried so far:
- Changing CPU multiplier to 41x vcore to 1.147 without offset = 1.33V reported by CPU-Z
- Tried rolling back the BIOS version to 1.8 using MFlash = no change

I hope there's a solution to this. I don't have much understanding of what controls vcore (bios, OS, ME, etc) so I don't know what else I can do to diagnose and fix this. If anyone could offer any solutions or help, I would appreciate it greatly.

Thanks for your time!

More about : msi z87 g45 4670k vcore setting set 147v reported

a c 120 K Overclocking
September 25, 2014 2:24:41 AM

Just use bios/uefi to see the readings for Vcore.
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September 25, 2014 2:43:21 AM

Hi, thanks for your reply. I opened up the uefi bios to look at the readings. It's floats around 1.200V when the setting is 1.147V without any offset. It's not as high as reported under the stresstest but there's still a disparity.
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a c 120 K Overclocking
September 25, 2014 2:45:01 AM

Whatever you set it at is for idle. Under load it will increase Vcore and its clock speed through Turbo Boost.
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September 25, 2014 3:40:07 AM

In my experience with this motherboard (just over a year), the value set for vcore has always been the upper limit that was never exceeded under many stresstests. And since I posted the OP, I actually have "regained" some more control over the vcore by clearing the CMOS.

I use inverted commas because it's constantly offset by +0.016V now, even with no changes to "vcore offset". I tested this at 4 different safe voltage settings.

I also stresstested the CPU at 1.160V (as read by uefi bios) at 4.0GHz, resulting in an instant BSOD. That means that at a lower clock and higher voltage than stable settings used 2 months ago, I'm getting BSODs instantly..

It seems like something more significant than buggy voltage control now. Do you have any other suspicions as to what's going on?



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a c 120 K Overclocking
September 25, 2014 3:42:44 AM

I'd RMA the mobo
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September 25, 2014 3:51:27 AM

i7Baby said:
I'd RMA the mobo


Oh bother :(  I was hoping it would not come to that. Thanks again for your advice and I'll send an email off to MSI.

I did do some tidying with power, sata, fan cables, but video cards and cpu fan were left alone. If some power cables were unseated, could that cause problems like what I'm experiencing?
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a c 120 K Overclocking
September 25, 2014 5:03:26 AM

Of course it would.
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!