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post #1671 of 1759 (permalink) Old 05-23-2019, 07:20 PM
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In case it hasn’t been referenced already...

Buildzoid covered LLC. Myself, I’ve noticed massive vdroops when using Intel XTU’s stress test. I didn’t want to put it on extreme and get an unnecessarily high Vcore so I added a bit more Vcore than what I needed to run under extreme LLC and changed extreme to turbo.

I’m using a gigabyte master,9900k and my current game and bench stable oc is 5.0ghz at 1.285v with turbo LLC



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post #1672 of 1759 (permalink) Old 05-24-2019, 02:42 PM
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The higher the LLC, the higher the transient voltage spikes will be. This is what will degrade the CPU.

I wouldn't use anything higher than LLC = High. I use LLC medium to be on the safe side, especially when running a high FMA3 load.

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post #1673 of 1759 (permalink) Old 05-24-2019, 10:33 PM
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Quote: Originally Posted by Pinnacle Fit View Post
In case it hasn’t been referenced already...

Buildzoid covered LLC. Myself, I’ve noticed massive vdroops when using Intel XTU’s stress test. I didn’t want to put it on extreme and get an unnecessarily high Vcore so I added a bit more Vcore than what I needed to run under extreme LLC and changed extreme to turbo.

I’m using a gigabyte master,9900k and my current game and bench stable oc is 5.0ghz at 1.285v with turbo LLC

https://youtu.be/NMIh8dTdJwI


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I had never seen that. Good video. EVGA did a really good job with their voltage regulation. Very close to the "Flat" he said was kind of unrealistic. I only see a .014v voltage swing even when running Prime95 w/ AVX pulling from 20w to 260w.

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post #1674 of 1759 (permalink) Old 05-24-2019, 10:45 PM
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Quote: Originally Posted by TahoeDust View Post
I had never seen that. Good video. EVGA did a really good job with their voltage regulation. Very close to the "Flat" he said was kind of unrealistic. I only see a .014v voltage swing even when running Prime95 w/ AVX pulling from 20w to 260w.
Did you check this with an oscilloscope? (this will show transient spikes and dips)
Or even with reading the cpu on -die sense voltage?

Gigabyte also shows "flat" voltage the same way you do, if you read the ITE 8792E vcore sensor, which is the same readout if you use the onboard read points.
This reading is the MLCC caps reading (aka behind the socket).

But hooking up a probe to the VCC_Sense and VSS_Sense lines coming from the VRM show a completely different story--this measurement matches VR VOUT within 10mv.

If "75% less vdroop" on the eVGA board gives flat voltage readout from idle and even running prime95 small FFT AVX, then it's doing the exact same thing Gigabyte LLC Turbo is doing.
LLC Turbo is 0.4 mOhms of vdroop. Default vdroop for 8 core CFL is 1.6 mOhms.
0.4 mOhms is 75% lower than 1.6 mOhms.

The math matches right up.
So it's highly probable that eVGA is doing the same reading (socket MLCC).

Also, "No vdroop" cannot have a sustained load voltage higher than idle voltage. No vdroop is a 0 mOhm loadline.
Vdroop is very simple:

mOhms * Amps = vdroop.

But only Gigabyte and some MSI (and Asrock?) boards have amps monitoring from the VRM. (IR 35201 / intersil).

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post #1675 of 1759 (permalink) Old 05-25-2019, 12:34 AM
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I don't believe load line calibration is for transient spikes. Wikipedia says load line is because the operation of transistors is nonlinear current vs the voltage.

Load line (electronics)
In graphical analysis of nonlinear electronic circuits, a load line is a line drawn on the characteristic curve, a graph of the current vs the voltage in a nonlinear device like a diode or transistor.
It represents the constraint put on the voltage and current in the nonlinear device by the external circuit. https://en.wikipedia.org/wiki/Load_line_(electronics)

So with a transistor low current draw the core voltage needs to be higher, then with high current draw the core voltage can be lower.


I have proven this many times on my own PC.
Running prime95 core voltage = 1.260v with LLC standard/Auto, C-states, EIST, DVID the PC is stable low current load and full current load.
Running prime95 core voltage = 1.260v with LLC Turbo, C-states, EIST, DVID the PC is stable full current load and crashes at low current load.

With fixed voltage I can run LLC standard/Auto running prime95 core voltage 1.260v PC is stable full load and stable at idle and low load.
With fixed voltage I can run LLC Turbo running prime95 core voltage 1.260v PC is stable full load then not stable at idle and low load.

If you ever wonder why some folks have stability problems at idle low load and not full load? it is because transistors are nonlinear current vs the voltage.

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post #1676 of 1759 (permalink) Old 05-26-2019, 05:48 PM
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9900k Overclock Results and Questions:

So I have a rock solid stable 9900k that clocks all cores 5.0ghz at 1.285V with turbo LLC...

Now that we’re hearing about the 9900ks, Is it gonna have much more of potential than the 9900k? I haven’t heard any word on what voltage the 9900ks is achieving its 5Ghz on. It appears to be the same silicon...

Maybe it’s just for people who can’t or don’t want to oc
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post #1677 of 1759 (permalink) Old 05-27-2019, 05:00 AM
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Quote: Originally Posted by Pinnacle Fit View Post
So I have a rock solid stable 9900k that clocks all cores 5.0ghz at 1.285V with turbo LLC...

Now that we’re hearing about the 9900ks, Is it gonna have much more of potential than the 9900k? I haven’t heard any word on what voltage the 9900ks is achieving its 5Ghz on. It appears to be the same silicon...

Maybe it’s just for people who can’t or don’t want to oc
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It's the 8086k equivalent of the 9900k. Meaning it's binned and might have more headroom but at worst case, you're guaranteed 5ghz all core speed. Really curious to see what volts they're going to run at.
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post #1678 of 1759 (permalink) Old 05-27-2019, 06:01 AM
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Quote: Originally Posted by robertr1 View Post
It's the 8086k equivalent of the 9900k. Meaning it's binned and might have more headroom but at worst case, you're guaranteed 5ghz all core speed. Really curious to see what volts they're going to run at.


That’s what I’m thinking.


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post #1679 of 1759 (permalink) Old 05-27-2019, 06:09 AM
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The Ks doesn't have an iGPU, that's the only difference as far as I am aware.

Sorry, my bad, that's the Kf.

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post #1680 of 1759 (permalink) Old 05-28-2019, 03:38 PM
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Quote: Originally Posted by moorhen2 View Post
The Ks doesn't have an iGPU, that's the only difference as far as I am aware.



Sorry, my bad, that's the Kf.


I just really wonder what voltage they’re getting that 5ghz on.


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