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Intel says the 9900k VCore limit is 1.52V?

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Hey guys I just built a new PC and did a quick overclock of 5.3GHz with 1.4V with XMP enabled on the RAM. It’s stable so far but I have yet to do any longer stress testing.

I have a custom loop with the EK Velocity block and their EK X-RES Revo Pump/Res combo. 2 EK radiators 1 360 and 1 280 I think from theIr EK Coolstream Slim lineup.

During gaming is stays around 60C currently and minimal stress testing I saw numbers in the Mid to High 70s I have more testing to do, what do you guys think is a safe 24/7 usage voltage for this CPU? That was on intels website for the 9900k, I have the 9900KS I’m not sure if they improved solder or still using TIM on this new chip. What is everyone’s take on this.
 
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That pump/res is the one with a D5?

Temps depend a lot on ambients, what are yours?

When you say 1.4V, is that the actual VCore under load, or what you have set in BIOS?

How about running some hard-core stress testing; LinX 0.9.5, or AIDA64 FPU and report temps for those?
 
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1.4V set in bios during Aida/Intel Burn reports around 1.39-1.41V on cpu-z. Yeah it is the D5 pump (is it good?) I only have the CPU in the loop I kept the GPU on air for now until I get a Flagship Ampere. My ambient temps are probably fluctuate between 60-70F this time of year they’ll get colder heading into winter downstate NY.

The temps while stressed are low 60s for low cores and low 80s for high cores overall mid-high 70s. What’s your take on Intel’s recommended peak voltage of 1.52V?
 
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Wouldn't be surprised, after all it's another 14nm chip......

This from reddit, but it's pretty much spot on. Click the ROG.ASUS link in the center of this dudes post for additional reading goods.

falkentyne

8 points·19 days ago·edited 19 days ago

Is your board a Maximus XI board (supports CPU differential on-die sense voltage monitoring) or a Gigabyte Z390 or other board with VR VOUT access and Amps (current monitoring or Current IOUT) monitoring in HWinfo64 ?
Maximum safe voltage electrical specification guidelines are based on:
  1. default VRM loadline (Intel specification of 1.6 mOhms) being respected as this is what the chips are designed for. Using a custom loadline calibration reduces the mOhms value (less mOhms=less vdroop) which will change the formula for what your processor is using, then you will have to match it to the "Intel" formula to compare.
  2. Amps limit being respected. (193 amps)
  3. Vcore / amps curve being respected.
This formula is based on Max VID=1.520v at 0 amps (no clock signal) under the following formula:
Max VID - (resistance * amps)= max safe live voltage, up to TJMAX.
where max VID is 1520mv (1.520v), max amps is 193 amps and resistance (Loadline or vdroop specification) is 1.6 mOhms. VID is in millivolts because resistance is in milliohms, thus the same units so no conversion is necessary in the math.
Total vdroop is amps * resistance.
1520 mv - (1.6 * amps) = max safe live voltage.
So you plug in how many amps you're pulling and then do the math.
Some quick values:
1520 - (1.6 * 193) = 1.213v.
1520 - (1.6 * 150) = 1.280v
1520 - (1.6 * 125) = 1.320v
1520 - (1.6 * 100) = 1.360v.
1520 - (1.6 * 75) = 1.400v.
And so on.
This is based on intel default loadline calibration and based on "Auto" Vcore and allowing the AC Loadline (NOT the same as VRM Loadline) to set the initial operating voltage, which is capped at 1.520v BEFORE VDROOP.
Also keep in mind these are MAXIMUM safe limits. This does not mean that you should run your processor 24/7 at the border and think it won't degrade any faster. While technically, you are still in Intel's specifications if you set a 1.520v bios voltage with INTEL DEFAULT loadline calibration (1.6 mOhms)--since there is going to be vdroop at idle, so the VR VOUT will never show 1.520v, is it really a good idea to have your IDLE voltage at absolute maximum before there is risk of damage? I don't think so!
Better to just set "Auto" Vcore and let AC Loadline and Thermal Velocity Boost control the input vcore then (with intel spec loadline calibration). TVB will reduce the base VID depending on temps as explained here:
https://rog.asus.com/forum/showthread.php?106375-MCE-explanations-and-others&highlight=explanations
That's why, at idle, with a max AC Loadline of 1.6 mOhms and a x50 multiplier and Intel spec Loadline calibration (LLC2 on Asus, "Standard" or "Normal" on Gigabyte Z390, your on-die sense vcore will be more like 1.41v rather than 1.48v (thanks to Thermal Velocity Boost !)
This 'initial operating voltage' is a complicated interaction between the "base CPU multiplier's original VID, Thermal Velocity Boost voltage optimizations, and AC Loadline mOhms value, where a higher ACLL will raise operating voltages. Max spec for ACLL is 1.6 mOhms--which is the same value as default "Vdroop" (VRM) loadline.
Using a custom LLC setting requires you to know how much vdroop is being reduced. For example, 50% vdroop reduction (e.g. -50% vdroop on eVGA Dark) is 0.8 mOhms (50% of 1.6). Asus Maximus XI LLC5 is also 50% reduced vdroop (0.8 mOhms) and Gigabyte's LLC High is 50% reduced vdroop.
LLC6 and "Turbo" LLC is 75% reduced vdroop, or 0.4 mOhms.
To calculate where you are in the safe voltage/amps curve on fixed manual vcore and custom LLC, you change the formula as such:
Bios set vcore - ( loadline calibration mOhms * CPU amps)= load cpu vcore (RMS) you are actually using.
For example:
1.340v Bios set and Loadline calibration: Turbo / LLC6, and pulling 150 amps:
1340 mv - (0.4 * 150) = 1280mv = 1.280v.
That means at 150 amps, 1.340v set in BIOS and 0.4 mOhms of loadline calibration, you are right at the max safe limit, and should be very careful about raising vcore without improving your cooling solution. (in this example, pulling less than 150 amps puts you below the safe limit, pulling more than 150 amps starts to put you beyond it).
 
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1.525 is the limit on my cpu before the board freaks out about ocp
 
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1.525 is the limit on my cpu before the board freaks out about ocp
Go to monitor and disable v-core monitoring. The board will stop "freeking out" or stopping post to remind you that v-core is set too high, F1 to continue.
 
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On my MSI board should I leave the LLC on Auto for best results while overclocking, it goes up by ‘Modes’ after Auto I think it goes up to Mode 7. I’m on the MEG MSI ACE Z390 which is supposed to be a pretty good overclocking board.
 
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On my MSI board should I leave the LLC on Auto for best results while overclocking, it goes up by ‘Modes’ after Auto I think it goes up to Mode 7. I’m on the MEG MSI ACE Z390 which is supposed to be a pretty good overclocking board.
That really depends on the results you're after, the cooling being used.

Since you aren't going for records, LLC on auto unless you get a lot of v-droop or too much over-colt compensation. My Asus board likes to OV past the VID with LLC on auto.
 
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That really depends on the results you're after, the cooling being used.

Since you aren't going for records, LLC on auto unless you get a lot of v-droop or too much over-colt compensation. My Asus board likes to OV past the VID with LLC on auto.
I’m not looking to compete for records in any way, I just want to try and get the best possible performance and stability using the most ideal settings. These days is using Intels XTU considered the same or as good as tuning in the UEFI/BIOS?
 
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If you try 1.5v on a 9900k expect fireworks.... 1.4v is pretty damn near uncoolable other than in gaming 1.3-1.35 is possible with good ambient and awesome cooling.... unless you have a really bad chip you shouldn't need more than 1.35v for 5ghz all core and anything above that you'll only notice in synthetics. My chip needs 1.28v for 5ghz and 1.325 for 5.1 which isn't worth it for the heat difference imo.
 
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Go to monitor and disable v-core monitoring. The board will stop "freeking out" or stopping post to remind you that v-core is set too high, F1 to continue.
I know, but I’m a chicken, that extra 100mhz isn’t worth it, I would be closer to 1.6v. I won’t bat an eye with that voltage on my x5690, but 1.6 on a 3770k just for 5ghz tells me I need to freeze it :laugh:

Alas I am broke for now. Once my loan is paid off I will be able to partake in this hobby again.
 
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I’m not looking to compete for records in any way, I just want to try and get the best possible performance and stability using the most ideal settings. These days is using Intels XTU considered the same or as good as tuning in the UEFI/BIOS?
Well that's an opinion based question. Yes and no. I think the software is good enough now that it's a non issue to use it, but I guess your most permanent tweaks are input via bios. Then you tweak further with software. Nothing wrong with it at all imo.

I know, but I’m a chicken, that extra 100mhz isn’t worth it, I would be closer to 1.6v. I won’t bat an eye with that voltage on my x5690, but 1.6 on a 3770k just for 5ghz tells me I need to freeze it :laugh:

Alas I am broke for now. Once my loan is paid off I will be able to partake in this hobby again.
Yea, not worth it, especially for any kind of daily use.

You'd gain some performance with your memory tweaking though.....
 
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If you try 1.5v on a 9900k expect fireworks.... 1.4v is pretty damn near uncoolable other than in gaming 1.3-1.35 is possible with good ambient and awesome cooling.... unless you have a really bad chip you shouldn't need more than 1.35v for 5ghz all core and anything above that you'll only notice in synthetics. My chip needs 1.28v for 5ghz and 1.325 for 5.1 which isn't worth it for the heat difference imo.
But what about the KS? Also I saw on another post your cinebench score was around 5000. I’m barely hitting 3000 at 5.3GHz, what is getting your score so high? Did you fine tune your RAM or something? I have CL 15 3200 TridentZ
 
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But what about the KS? Also I saw on another post your cinebench score was around 5000. I’m barely hitting 3000 at 5.3GHz, what is getting your score so high? Did you fine tune your RAM or something? I have CL 15 3200 TridentZ
9900KS should do 5Ghz at 1.25v according to reviews. Did you check for throtteling? 3000 is really low, my 9900k at 5Ghz does 5305 points in R20 with 3600Mhz CL17 RAM
 
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9900KS should do 5Ghz at 1.25v according to reviews. Did you check for throtteling? 3000 is really low, my 9900k at 5Ghz does 5305 points in R20 with 3600Mhz CL17 RAM
How would I check for throttling my temps don’t go over 80? What steps should I go through?
 
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Look at somethng like CPU-Z or HWInfo what the clockspeed is while running Cinebench. Before you do, check for background processes that are running. They kill your scores.
 
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Look at somethng like CPU-Z or HWInfo what the clockspeed is while running Cinebench. Before you do, check for background processes that are running. They kill your scores.
Like which processes...I have a ton running :()

While running cinebench on the overclock CPU-Z and Task Manager both say full utilization, some cores hit mid 80's, which is a little too hot for my liking I definitely have to tune the voltage / core speed further. I still don't understand why my score would be so low, now it's down to 2100~.

I just ran cinebench again with everything default, only XMP on and it went down to 1679. Something isn't right, could it be a setting within Cinebench?

I don't know what it could be, I just ran it again, for some reason turbo boost turned off last time, now at default with turbo boost on it's running a 2050 score, Voltage at 1.248, VID around 1.29~ no thermal or power throttling. Temps are way down around mid 60's at least. Something is off with the score though.
 
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i dont have a msi board but i would play with this setting according to others which had probs during oc:
CPU Lite Load [Auto]
This item is used to reduce the CPU power and temperature under non-overclocking and non-overvoltage conditions. Select higher mode if system is unstable. Auto is the recommended.

Mode 9 gibt 1.200V unter Last, Mode 12 wohl um die 1.250V.
from pcgh
 
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Like which processes...I have a ton running :()

While running cinebench on the overclock CPU-Z and Task Manager both say full utilization, some cores hit mid 80's, which is a little too hot for my liking I definitely have to tune the voltage / core speed further. I still don't understand why my score would be so low, now it's down to 2100~.

I just ran cinebench again with everything default, only XMP on and it went down to 1679. Something isn't right, could it be a setting within Cinebench?

I don't know what it could be, I just ran it again, for some reason turbo boost turned off last time, now at default with turbo boost on it's running a 2050 score, Voltage at 1.248, VID around 1.29~ no thermal or power throttling. Temps are way down around mid 60's at least. Something is off with the score though.
Since you've changed a lot (some?) of settings in bios, clear cmos or restore defaults and try this benchmark with the system at stock.

Post benchmark with cpu-z tabs cpu, mem, spd and motherboard. This will help people reference some numbers of what your system is actually running. Temp monitoring helps too if you can.

Then run your usual overclock (which should improve the score) and do the same with the cpu-z tabs all visible along with the benchmark results.

Perhaps someone can help pick out the issue with some visuals. So far we have a score going down and really no other figures to go by besides maybe temp.
 
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Since you've changed a lot (some?) of settings in bios, clear cmos or restore defaults and try this benchmark with the system at stock.

Post benchmark with cpu-z tabs cpu, mem, spd and motherboard. This will help people reference some numbers of what your system is actually running. Temp monitoring helps too if you can.

Then run your usual overclock (which should improve the score) and do the same with the cpu-z tabs all visible along with the benchmark results.

Perhaps someone can help pick out the issue with some visuals. So far we have a score going down and really no other figures to go by besides maybe temp.
I will do it tonight when I’m off around 10PM EST, thanks for everyone’s time and input I really appreciate it. I’m sure it’s just a setting or possibly a process within windows, otherwise it passes stress tests without throttling albeit short tests so far at default. Otherwise the system feels very responsive and is noticeably quicker than my old setup. Anyway it could be a display setting? I’m pretty sure the LG GK350F is native 144Hz I don’t think that’s an overclock on the panel I would think that would mainly affect the GPU anyway.

I guess no one is too familiar with the new MSI UEFI, clearing the CMOS could help after playing with the settings a lot things can get thrown off a bit I’ve come to realize with my past couple of boards. I wish I knew what every setting actually did there’s almost too many settings to become familiar with and understand at a fundamental level.
 
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I will do it tonight when I’m off around 10PM EST, thanks for everyone’s time and input I really appreciate it. I’m sure it’s just a setting or possibly a process within windows, otherwise it passes stress tests without throttling albeit short tests so far at default. Otherwise the system feels very responsive and is noticeably quicker than my old setup. Anyway it could be a display setting? I’m pretty sure the LG GK350F is native 144Hz I don’t think that’s an overclock on the panel I would think that would mainly affect the GPU anyway.

I guess no one is too familiar with the new MSI UEFI, clearing the CMOS could help after playing with the settings a lot things can get thrown off a bit I’ve come to realize with my past couple of boards. I wish I knew what every setting actually did there’s almost too many settings to become familiar with and understand at a fundamental level.
Make a new thread for it though. We don't want to take away from the OP.
 
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Make a new thread for it though. We don't want to take away from the OP.
I am the OP, I just realized the board comes with 2 8 pin connectors for the CPU is it necessary to connect both I figured only 1 would need to be connected.
 

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Unless using LN2 cooling, one 8-pin is plenty.
 
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I am the OP, I just realized the board comes with 2 8 pin connectors for the CPU is it necessary to connect both I figured only 1 would need to be connected.
Well we'll leave the 1.500v at the door then lol.

When you get home, post up those screenies.

Then, maybe I'll help you O.C. the memory. It's terribly slow for an Intel IMC. Want to try and get a min of 3600mhz from that TridentZ. You will see vast performance improvement.
 
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Well we'll leave the 1.500v at the door then lol.

When you get home, post up those screenies.

Then, maybe I'll help you O.C. the memory. It's terribly slow for an Intel IMC. Want to try and get a min of 3600mhz from that TridentZ. You will see vast performance improvement.
Sounds good brother will definitely do, thank you, I’ll be on between 9-10pm EST

I have a second 8 pin psu cable available if anyone thinks it could help, just a FYI.
 
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