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~1.8v VCORE - is this a false reading?

 
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post #1 of 2 (permalink) Old 06-12-2020, 05:20 AM - Thread Starter
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~1.8v VCORE - is this a false reading?

Hi all,

Last year I switched the e3-1231v3 out of my desktop for a 4790k (Z97), and I've finally got around to buying a cheap server motherboard (Asus P9D-V) to upgrade my project DIY NAS to use the 1231v3.

However, during setup I noticed that BIOS was reporting a VCORE of around ~1.8v. So after checking temps and seeing they were in an expected range, I booted through to Linux and using lm-sensors I found it was also reporting around 1.8v. Using another computer, I threw a quick windows install on an old SSD and put HWMonitor, CPU-Z, and Cinebench R15 onto it. Interestingly, the motherboard voltage sensors in HWMonitor reported a VCORE ~1.8v, but the CPU section reported each core's VID at ~1.02v at idle and ~1.06-1.1v when running Cinebench R15. CPU-Z reports the core voltage identically to HWMonitor's VID.

I seem to remember Haswell having a 1.8v input voltage from the motherboard, before being regulated down to the actual core voltage. I'm inclined to believe that software is incorrectly reporting the CPU input voltage here as VCORE, while HWMonitor and CPU-Z are accurately showing the core voltage. It ran Memtest86+ for 16 hours (for a different reason) before I decided to turn it off and get confirmation of my suspicions.

I have attached some imagesshowing the figures.

So what do you think, is this just a misrepresented sensor reading?
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In a topic about someone turning a working PIII-1ghz into a key chain:
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post #2 of 2 (permalink) Old 06-12-2020, 05:36 AM
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I'm thinking the same as you, that 1.8V is probably the input voltage, not Vcore.

The way I remember how Haswell worked is this: on Haswell generation processors the motherboard provides a "V_IN" voltage, not a Vcore voltage. The Vcore is built by the CPU itself out of the VIN voltage. Haswell has internal VRM to do this. The VIN voltage from the motherboard is pretty high. I bet those 1.8V you are looking at is that VIN voltage.

Perhaps check out a different program named "HWINFO". In my experience, HWMonitor was regularly a bit disappointing. It often didn't use good names for sensors. The HWINFO program always could show many more sensors than HWMonitor on all computers I tried it on, and the names were better.
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