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9900k: large Vdroop. Is load voltage the main 1 to watch?

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post #1 of 20 (permalink) Old 11-28-2018, 05:03 PM - Thread Starter
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9900k: large Vdroop. Is load voltage the main 1 to watch?

Hi. My maximus xi formula has large vdroop. LLC6 1.37v bios down to 1.26v under load. Is voltage under load the main 1 to watch? Is it fine to start settings 1.41v in bios to push for 5.1ghz seeing as vdroop will end up at around 1.29-1.3v?

Llc7 improves the vdroop by about .03 but bring extra heat.

Any help qould be great thanks.
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post #2 of 20 (permalink) Old 11-28-2018, 05:57 PM
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Quote: Originally Posted by Jaz11 View Post
Hi. My maximus xi formula has large vdroop. LLC6 1.37v bios down to 1.26v under load. Is voltage under load the main 1 to watch? Is it fine to start settings 1.41v in bios to push for 5.1ghz seeing as vdroop will end up at around 1.29-1.3v?

Llc7 improves the vdroop by about .03 but bring extra heat.

Any help qould be great thanks.
What is the highest LLC on your mainboard?
Are you using static or adaptive (normal / auto) voltages?
1.37v idle to 1.26v load is massive. Have you tested the voltages with a digital multimeter to see if the sensors are wrong?
In your "1.37v idle, 1.26v load", does your "CPU VID" also read 1.37v idle and 1.26v load (VID, not vcore?).

1.37v to 1.26v is basically NO LLC at all.
What happens if you use LLC5 or LLC4?
Test the others. Perhaps LLC6 is just busted and not working?

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post #3 of 20 (permalink) Old 11-28-2018, 06:04 PM
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Try something else. 1.37v down to 1.26v is huge. My board runs closest to what I set at LLC 4 or 5. At LLC4 it slightly droops under load and LLC5 slightly over volts on load, but both are rock solid at what I set in the BIOS at idle.

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post #4 of 20 (permalink) Old 11-28-2018, 06:10 PM
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How much it improves with CPU capability set to 120-130% (stock is 100%). This one is related to power consumption just like power target works for GPUs. Have you tried any other BIOS? or are you using the latest?

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post #5 of 20 (permalink) Old 11-28-2018, 06:14 PM
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Quote: Originally Posted by Samsarulz View Post
How much it improves with CPU capability set to 120-130% (stock is 100%). This one is related to power consumption just like power target works for GPUs. Have you tried any other BIOS? or are you using the latest?

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post #6 of 20 (permalink) Old 11-28-2018, 07:54 PM
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Quote: Originally Posted by The Pook View Post
First time I seen you on OCN! I've tried to beat a bunch of your HWBOT results but I don't think I ever did

Off Topic: Im more in the marketplace. Purchase stuff and then sell locally (in Chile). Some results are very good but I have some people helping me with tweaks and good advices. Are you in the LN2/DICE route or not yet? Whats your HWbot profile?

On Topic: As for the 9900K i also believe that more than 100 mV of vdroop is a lot. Have only seen similar behaviour in old MSI motherboards such as the MPower Z77.



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post #7 of 20 (permalink) Old 11-28-2018, 08:37 PM
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The Asus boards seem to have a bit more vdroop than others, but on LLC 7 it's manageable. On mine it droops about .05-.06v at full load regardless of voltage. So if I have it at 1.30v it might droop to like 1.25v. Dunno what the deal is. It is somewhat annoying. Behaves the same on manual and adaptive. At 5.1GHz at 1.305v adaptive LLC7 (AC DC LL @ .01) I droop to 1.252 vcore under load. The peak vcore reading, similar to what it would be idle on manual voltage, is 1.296v. VID is meaningless, especially since I'm using adaptive voltage at the moment, but it reads around 1.309v under load and drops way down at idle.

Why are you using so much voltage? If you have to push anywhere near 1.40v for 5.1Ghz you probably shouldn't bother. You likely just got a less than ideal chip. You won't be able to cool anything north of around 1.37v under full load without a custom loop or extreme cooling anyways. I know, because on mine 5.2GHz was looking like it was gonna take around 1.37 or 1.38v and I stopped pretty quickly after a few stress tests and benchmarks. There was no point other than to set a score or something; it made zero sense for 24/7 use. Just run it at 5.0GHz at a lower voltage and call it good.
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post #8 of 20 (permalink) Old 11-28-2018, 08:50 PM
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M11 doesn't have more droop, they just read the CPU Core Voltage more accurately than other boards.

https://www.overclock.net/forum/27686004-post2664.html
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post #9 of 20 (permalink) Old 11-28-2018, 08:58 PM
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Quote: Originally Posted by elmor View Post
M11 doesn't have more droop, they just read the CPU Core Voltage more accurately than other boards.

https://www.overclock.net/forum/27686004-post2664.html
Yeah I saw that earlier Elmor. Thanks for writing that.

I'm not sure I totally understand though. Are you saying that the level of droop on M11 is comparable to competing boards, but that other boards are just reading erroneously high vcore values due to their method of measuring? So in my case if I was using like a Gigabyte board or something I might only see my 1.305v drop to 1.28v under load, but at the CPU it's actually more or less the same as what the M11 reads (1.25v)?

Last edited by tostitobandito; 11-28-2018 at 09:01 PM.
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post #10 of 20 (permalink) Old 11-28-2018, 09:08 PM
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Quote: Originally Posted by tostitobandito View Post
Yeah I saw that earlier Elmor. Thanks for writing that.

I'm not sure I totally understand though. Are you saying that the level of droop on M11 is comparable to competing boards, but that other boards are just reading erroneously high vcore values due to their method of measuring? So in my case if I was using like a Gigabyte board or something I might only see my 1.305v drop to 1.28v under load, but at the CPU it's actually more or less the same as what the M11 reads?
The LLC settings and resulting droop on M11 are the same as on M10, but with better SIO readings. From what I've seen other boards are showing values similar to M10.

SIO (traditional) in the graph refers to Maximus X Hero.



For example: If you set Manual Mode Voltage = 1.300V + Load-line Calibration = Level 6 on Maximus X Hero, CPU-Z or other software will read 1.312V. On Maximus XI Hero the reading will be 1.190V. The actual voltage the CPU is getting is 1.205V in both cases. The difference is amplified at larger currents, with 9900K the difference is larger than with previous CPUs.

Last edited by elmor; 11-28-2018 at 09:14 PM.
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