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#77 Последний выпуск для серии карт Kepler: GeForce 475.14 WHQL (09.07.2024) Windows 10/11 | 64-bit
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#77 Последний выпуск для серии карт Fermi: GeForce 391.35 WHQL (27.03.2018) Windows 10 | 32-bit & 64-bit
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#77 Последний выпуск для серии карт GT/GTX 200, 300, 400: GeForce 342.01 WHQL (14.12.2016) Windows 10 | 32-bit & 64-bit
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The LLC, DC_LL and AC_LL numbers:
This Is the Board Maximus Z-790 Extreme LLC Impedance table*:

LLC1: 1.75 milliohms
LLC2: 1.46 milliohms
LLC3: 1.1 milliohms
LLC4: 0.98 milliohms
LLC5: 0.73 milliohms
LLC6: 0.49 milliohms
LLC7: 0.24 milliohms
LLC8: 0.01 milliohms (flat).

The majority of Asus motherboards have the same LLC impedance.
*Some adjustment may be necessary (usually +/- 5%).


The impedance values of the DC_LL shall be used according to the LLC chosen, so that the CPU performs its internal voltage and power calculations accurately.

Impedance stake:

DC_LL=LLC: The CPU performs correct VID and power calculations;
DC_LL<LLC: The CPU performs higher than real VID and power calculations;
DC_LL>LLC: The CPU performs lower than real VID and power calculations.

So, rule is: ALWAYS TUNE The DC_LL according to the LLC chosen.

And here I have very good news for you !!!!
Asus linked the LLC impedance to DC_LL automatically in the Z790.
So when you set a LLC#, if you let the DC_LL in AUTO the BIOS will adjust it for you !!!

The LLC controls the output impedance of our VRM, and MB vendors allow us to change and control this impedance.

DC_LL is the parameter that informs the CPU the VRM impedance.
If you decide to use LLC #1, the impedance is 1.75mohm, then you need to inform the CPU of this impedance using the DC_LL parameter.
If you use LLC #4 then the DC_LL should be 0.98.

To find the LLC impedance, you need to test (under load) one by one LLC and change the DC_LL until the VRM power matches the CPU power and the VID matches the Vcore. Once they match, you found LLC impedance.

AC_LL is a parameter that compensates for voltage loss due to your load line impedance, and you need to guess and test a different number for each LLC.

If you use a high impedance LLC you will need a higher AC_LL, on the other hand if you use a low impedance LLC you will need a low AC_LL
Note that on Asus MB, LLC # high means low impedance. And LLC # low means high impedance.

So never use a low impedance LLC with a high AC_LL... This will result in a very high voltage....
That's why I recommend an IA VR voltage limit of 1700mv...
So if you commit an error, the voltage will have a limit.

Simplifying the formulas:

You have the VF curve VID... Let's call it raw-vid.
That VID you see in hw-info, let's call it VID
You have the LLC impedance, let's call it LLC#
You have the DC_LL impedance parameter, let's call it DC_LL
You have AC_LL impedance compensation, let's call it AC_LL.
You have the CPU current, let's call it Amp.
You have the offsets and temperature components that we're not going to use to make things easier right now.
You have the Vcore, and let's call it Vcore.

So....

VID = raw-vid + (AC_LL * Amp) - (DC_LL * Amp)

Vcore = raw-vid + (AC_LL * Amp) - (LLC# * Amp)

This is how I found the LLC impedance.
If DC_LL = LLC than VID=Vcore at full load.

The Intel recommendation is to use AC_LL = DC_LL and LLC#3 (for asus MB)
So the intel recommendation is:

LLC = 1.1 mhom
AC_LL = 1.1mhom
DC_LL = 1.1mhom

It's a very conservative setting that will work with any poor MB.
Using AC_LL = LLC #, the lost voltage caused by VRM impedance will be compensated by AC_LL.

But we want to UNDERVOLT the CPU, right?

So, we will use AC_LL < DC_LL

But how to find the correct numbers?
Testing the combinations.
Each CPU will respond depending on the silicon lottery.