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Z370 / Z390 VRM Discussion Thread

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post #3921 of 4007 (permalink) Old 02-07-2019, 06:31 AM
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Quote: Originally Posted by jfriend00 View Post
It would take a bunch of work to account for the 100w. 6% of 300 would account for 18% right there. Then, keep in mind there's hard drives, case fans, memory sticks, graphics cards, USB peripherals, other chips on the mainboard, etc... in addition to the VRMs.
SSD, memory, graphic card (tested with integrated), USB and other stuff is not taxed during P95 Small FFT load. But I was thinking about fans already without doing a proper comparison yet. Turns out that the fans (5x 120 mm + AIO pump) account for a total of 15 watts out of those 100 watts. 6% efficiency loss from the power-supply accounts for around another 16 watts.

So this leaves us with about 70 watts of extra power draw on top of what the CPU is reporting as package power, or 100 watts over what the mainboard is reporting as POUT. That's still a lot of power that mostly seems to turn into heat. I will check different VRM phase control settings (MB defaults to Extreme) to see how this affects this peak output specifically.
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post #3922 of 4007 (permalink) Old 02-08-2019, 11:25 AM
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VRM temperature plays its part, too. There is a 5-10 watts difference for the same CPU load between the VRM being cool or hot.
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post #3923 of 4007 (permalink) Old 02-09-2019, 06:08 PM
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VRM phase control does nothing for power draw at this peak load, VRM switching rate changes power draw only by 1-2 watts (going between 300 and 500 kHz). So am I mostly looking at over 70 watts of power being turned into heat by the Aorus Master's VRM section? Or is it heat produced by the CPU that is not reported as CPU Package Power (even less so as POUT)?
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post #3924 of 4007 (permalink) Old 02-09-2019, 10:19 PM
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Quote: Originally Posted by Timur Born View Post
VRM phase control does nothing for power draw at this peak load, VRM switching rate changes power draw only by 1-2 watts (going between 300 and 500 kHz). So am I mostly looking at over 70 watts of power being turned into heat by the Aorus Master's VRM section? Or is it heat produced by the CPU that is not reported as CPU Package Power (even less so as POUT)?
CPU Package Power= CPU VID * Amps (IOUT)
POUT: CPU On-die sense (VR VOUT) * IOUT (excluding virus overshoot in microseconds, only detectable on an oscilloscope).

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post #3925 of 4007 (permalink) Old 02-10-2019, 02:10 AM
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I don't fully trust POUT, because it reads bogus values during idle. It can read 0 (zero!) and it can read too much during idle when Speedshift is used (along with VOUT). If POUT is correct during peak load then the difference compared to the wall is even bigger (100w).

So where does all that (30% of total) power go other than VRM heat? Is this really efficient?

Last edited by Timur Born; 02-10-2019 at 02:14 AM.
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post #3926 of 4007 (permalink) Old 02-10-2019, 12:49 PM
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Quote: Originally Posted by Falkentyne View Post
CPU Package Power= CPU VID * Amps (IOUT)
POUT: CPU On-die sense (VR VOUT) * IOUT (excluding virus overshoot in microseconds, only detectable on an oscilloscope).
The motherboard Vcore sensors take 10 samples per second. If you run Vcore monitoring for a hour folks will pick up the peak voltage spikes randomly. The motherboard Vcore sensor only has to land sampling on Vcore spike.

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post #3927 of 4007 (permalink) Old 02-10-2019, 01:03 PM
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Quote: Originally Posted by wingman99 View Post
The motherboard Vcore sensors take 10 samples per second. If you run Vcore monitoring for a hour folks will pick up the peak voltage spikes randomly. The motherboard Vcore sensor only has to land sampling on Vcore spike.
This is not what Elmor told me.

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post #3928 of 4007 (permalink) Old 02-10-2019, 02:01 PM
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Quote: Originally Posted by Falkentyne View Post
This is not what Elmor told me.
Check it your self.

This is mine
Sampling for 1 Minute Fixed Vcore BIOS 1.260v LLC Turbo Minimum and Maximum Vcore 1.248v to 1.272v
Sampling for 2 Hours Fixed Vcore BIOS 1.260v LLC Turbo Minimum and Maximum Vcore 1.212v to 1.332v

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post #3929 of 4007 (permalink) Old 02-10-2019, 06:23 PM
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Quote: Originally Posted by wingman99 View Post
Check it your self.

This is mine
Sampling for 1 Minute Fixed Vcore BIOS 1.260v LLC Turbo Minimum and Maximum Vcore 1.248v to 1.272v
Sampling for 2 Hours Fixed Vcore BIOS 1.260v LLC Turbo Minimum and Maximum Vcore 1.212v to 1.332v
That's the SIO register. That has nothing to do with voltage spikes.
You need an oscilloscope for those.
VR VOUT has even bigger spikes when you use LLC Ultra Extreme, and if you leave it running for 10 hours, neither the ITE 8792E or IR 35201 VRM sensor will read such a massive spike. (8792E will rise at load and remain there, 35201 will remain at bios setting).

Buy an oscilloscope and check for yourself.

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post #3930 of 4007 (permalink) Old 02-10-2019, 07:21 PM
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Any idea where to find information about the MP86945 that supposedly powers the Supermicro Z390-CG board? (according to anandtech) I tried googling the part number, but I didn't get any results.
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K6 Motherboard , Msi , voltage regulator , z370 vrm , z390 , z390 vrm

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