If VR VOUT is correct and not Vcore then why is it reading such values?

spin5000 · Sep 30, 2021

Both Vcores are reading 0.68ish to 0.78ish volts while my 11900K is at idle and 800 MHz which is obviously how it's supposed to be (unless running fixed/static vcore of course) yet my VR VOUT is reading 1.582 to 1.595 volts which is beyond lunacy.

So are you telling me my motherboard is actually feeding my CPU almost 1.6v while at idle and at 800 MHz? If it's not, then where did this whole "ignore Vcore and pay attention to VR VOUT" thing come from?

P.S. I've had this same behavior with 3 CPUs (9700KF, 10900K, 11900K) and 2 motherboards (Gigabyte Z390 Aorus Pro, Gigabyte Z590 Aorus Ultra) and even multiple BIOS versions for each board....

jonkrmr · Sep 30, 2021

VR OUT is a more accurate voltage reading than Vcore. It is about the measuring points for the voltage and the VR OUT will have less resistance so will give a more accurate reading of voltage that Vcore which is read at the CPU socket and will have more resistance from the electrical traces to the socket from the VRM.

No your CPU is not running at 1.5xx volts at idle.

VRM voltage output is constant to the CPU and the CPU internally reduces this to the voltage the CPU needs for the given load.

spin5000 · Sep 30, 2021

jonkrmr said:
No your CPU is not running at 1.5xx volts at idle.

VRM voltage output is constant to the CPU and the CPU internally reduces this to the voltage the CPU needs for the given load.

My CPU is running at 800 MHz and idle therefore the voltage should be around 0.6 - 0.8 volts. Both VCore readings, according to HWInfo, are reading around 0.7 - 0.8 volts yet VR VOUT is reading an almost CPU killing 1.6v...so how is the VR VOUT reading more accurate than the Vcore reading/s if VR VOUT is reporting an insanely wrong value while VCore readings are exactly around where they should be? Seems like the opposite is true, at least in this case...

jonkrmr · Sep 30, 2021

VR OUT is showing you the voltage the VRM is supplying to the CPU.

It is the CPU itself that determines the voltage required for a given load up to the VR OUT voltage supplied.

When your CPU is at idle, it will reduce the supplied voltage to what it needs. In this case .6-.8 volt at 800MHz.

When the CPU is under a load, it will increase the voltage needed up to the VR OUT voltage if needed.

The VRM is a constant voltage supply to the CPU, it does not go up and down like the CPU's voltage does.

Again, it is the CPU that determines the voltage it needs internally for any given load on it.

So yes, you have 1.6v at the VRM output to the CPU but the CPU is not using all that 1.6v at idle.

I would like to know what voltage your CPU is using at full load as 1.6v from the VRM is a bit high and you might need to turn that voltage down a bit in BIOS.

VR OUT is a more accurate measurement of the voltage than Vcore because the reading of the VR OUT voltage is taken right at the VRM power stages thus not incurring any resistance from the electrical traces. The Vcore voltage is measured at the CPU socket power pins and thus incures some resistance from the electrical traces from the VRM to the CPU socket and this makes the voltage reading a little higher than it really is at the CPU socket.

This is why VR OUT voltage reading is more accurate of the true voltage being supplied by the VRM than the Vcore voltage reading is.

Your CPU is not running at 1.6v at idle..........

Look at it this way, your VRM is the power supply and your CPU decides how much voltage it needs being given from the power supply up to the max the power supply is giving to the CPU.

644835 · Sep 30, 2021

Please, can you provide HWInfo screenshots, that we can check your settings and voltages.
Thank you.

Falkentyne · Sep 30, 2021

spin5000 said:
My CPU is running at 800 MHz and idle therefore the voltage should be around 0.6 - 0.8 volts. Both VCore readings, according to HWInfo, are reading around 0.7 - 0.8 volts yet VR VOUT is reading an almost CPU killing 1.6v...so how is the VR VOUT reading more accurate than the Vcore reading/s if VR VOUT is reporting an insanely wrong value while VCore readings are exactly around where they should be? Seems like the opposite is true, at least in this case...

What is your vcore set at in the bios? what LLC?

spin5000 · Oct 1, 2021

Falkentyne said:
What is your vcore set at in the bios? what LLC?

Currently auto on both. I'm stable with fixed vcore at 1.39v 5.1 GHz all-core and 1.45v (possibly lower) 5.2 GHz all-core - both with LLC @ "high" [level 5 of 8 (8 being most aggressive)] - however it seems motherboards don't allow users to specify voltages for different frequencies (ie. different points on the VF curve) and we have to instead use offsets which is a mess for me therefore I'm currently experimenting with auto voltage & LLC.

I just want to setup the system like I have it in fixed vcore mode which is 1.45v 5.2 GHz all-core w/ LLC 5/8 but I also want to see how high I can go when not using all-core (eg. 5.5 GHz single core, 5.3 GHz 4-cores, etc.) along with having the cpu voltage adjusting so that it doesn't keep blasting tons of volts into the CPU while it's idling and at 800 MHz (especially since I tend to leave my CPU running 24/7 a lot of times). It's extremely difficult to experiment with this for a variety of reasons - A. not being able to specify voltages for particular frequencies (we have to experiment trial & error with offsets instead), and B. having sometimes wildly different as well as inconsistent values when it comes to VR VOUT and VCore readings...Sometimes they're fairly close, sometimes VR VOUT is way higher, sometimes VCore is higher.

jonkrmr · Oct 1, 2021

Maybe you need to do some reading up on how VRMs and CPU power works.

Seems like you are still stuck on the 1.6v VR OUT reading and fixating on it and the difference from Vcore.

Motherboard auto voltage settings push too much voltage, you will need to set them to lower manual voltage settings.

Idle voltage is not the issue. 1.6v at load will be.

If VR VOUT is correct and not Vcore then why is it reading such values?

spin5000

jonkrmr

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644835

Falkentyne

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