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I7 4790k - vCore 1.49V in Gigabyte UEFI

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July 2, 2014 1:45:10 AM

Hi,

Just started my build, so far just CPU and memory connected, no peripherals etc.

The Gigabyte z97 Gaming G1 board is default to a vCore of 1.49V for 4.4GHz in the UEFI. When I disable turbo boost, i get 1.29V for 4Ghz. Are these on the high side? I'm told UEFI isn't idle which could be lending to the higher voltage than I would expect.

Should I just wait until I get Windows installed and go by what Cpu-z/speccy report?

Regards,

Jack
July 2, 2014 1:47:05 AM

Oh and I'm getting 35C on the 4Ghz, and 47-49 on the 4.4Ghz as far as temperatures go, using a Phanteks CPu cooler. These sound higher than I hoped for, but I have a feeling this is being caused by the higher voltages.
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July 2, 2014 2:45:25 AM

I presume that the motherboard has an overclocking profile which sets a clock speed and voltage for you? If so, I'd recommend you ignore it. Manual voltage will always get better results.

Wait until you get Windows installed and can run a stress test. At idle, 35C is fine but 49C is too high for my liking.

Your voltage is certainly higher than I'd expect, but that doesn't mean it's unsafe. The common misconception is that high voltage will degrade a processor. In fact, it's the associated and untreated increase in heat which does it.

When overclocking you should always disable Turbo Boost, as you're already going beyond that clock speed.

I recommend that you finish the Windows installation and get the PC into the same state that you'd use it in. Then, download Prime95, which will stress test the processor and give you an idea of how high the temperature goes in a worst-case-scenario scenario. It's debateable how high you should go; I prefer to keep it below 75C.
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July 2, 2014 3:25:05 AM

Hi,

Many thanks for your reply. I've just been told over in an "owners club" forum that this board does indeed have a problem setting Voltage too high, and its been fixed in a later BIOS. I'm going to flash that tonight and hopefully see the decrease reported by others!

Regards,

Jack
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July 2, 2014 3:30:24 AM

Sounds good, best of luck.
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July 7, 2014 4:43:38 AM

Just update your bios to the newest version. I had the same problem, 1,392 Vcore for my i7 4790K. thats way too much. After update bios sets 1,18 Volt.
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July 7, 2014 4:47:02 AM

Yup bios update did the trick"
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August 8, 2014 7:56:41 AM

Hm, did not solve the problem for me. I have a Gigabyte Z97X UD3H. Turbo mode is turned off and the lastest BIOS update is installed (F7). My PC randomly restarts without a bluescreen. No idea what I can do to solve this.
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