Maximus XIII Hero LLC impedances?

[CypherBlaze1]

Does anyone here know what the impedance is for each LLC level on the Maximus XIII Hero?

I can't find this info anywhere, all I can find is this post https://www.overclock.net/threads/guide-tuning-adaptive-mode-oc-load-voltages-for-10th-and-9th-gen-c...

The user who posted it, AcidBath, says "For my ROG Maximus XII Hero mobo, the impedance for LLC 3 is 1.28 mohm, LLC 4 is 1.10 mohm and LLC 5 is 0.81 mohm."

But that's for the XII Hero, not the XIII Hero.

Does anyone know where AcidBath got that information for his board, and where I can find that info for my XIII Hero?

Or maybe the XII and XIII both have the same impedances?

I read that for adaptive voltage, it's best to set the IA DC LL impedance to the same impedance as the LLC, but I don't know what the impedance of my LLC (Level 4) is

[geneo]

What processor? I believe that matters.

[CypherBlaze1]

It's a 10900K. The SP score displayed in BIOS is 63, which is pretty typical for this processor from what I understand. Don't know if that also matters

[geneo]

Well I had a list but couldn't find it. I know for sure LLC5 is IA DC LL  = 0.8 (it is what I am using).

I have to go to an appointment right now. I will post later how you can determine them and why they are important (I had determined them but lost my ****** note).

[CypherBlaze1]

Awesome, thanks for your help. I'm very new to overclocking, and I'm learning as I go.

Your 0.8 for LLC5 is very close to the 0.81 that AcidBath says he has on his Maxinus XII Hero with the same CPU. I'm assuming LLC4 will also be very close to the 1.1 in AcidBath's post

But I'll wait for your reply. Good luck with your appointment

[geneo · Accepted solution]

OK. First  the reason why you want the IA DC LL to match the LLC. The LLC is controlled by the VRM and the IA DC and IA AC LL by the processor. It is the IA AC and LLC that determine the voltage the processor gets. The processor uses the IA AC LL to determine what voltage to request of the VRM, then the VRM uses that request + LLC LL to supply it to the processor.  The processor knows the IA AC you set and the current, but doesn't know the VRM LLC, so it cannot determine the voltage and hence also the power (voltage x current).  But it is the processor that makes decisions on whether to throttle frequency if voltage and power limits are exceeded, so it needs to know the actual voltage. Since it doesn't know the LLC LL, it uses the IA DC LL instead. If the IA DC LL is not equal to the LLC, then the voltage and power will be calculated incorrectly, and the processor will not throttle at the proper voltage and power limits.

I do think that 1.1 for LLC4 is correct, but there is a way to determine whether it is (or estimate the value is for any LLC) using HWINFO64.

The circled blue values are the correct values for vcore (assuming die-sense vcore measurement) and Power. The "CPU Core Power" comes from the Asus motherboard EC chip that knows the correct voltage, current and power. vcore is measured at the chip.

The circled red is the Intel processor section and hence the IA Cores Power highlighted in green depends on the IA DC LL, so will only be correct if the IA DC LL = LLC LL.  The VID displayed  in the circled green section also use the  IA DC so won't agree with vcore unless IAC DC LL = LLC LL.

So after that long winded explanation, you can trial and error IA DC LL, look at these values in HWINFO64  under load, and you'll know you have the the IA DC LL very close to the LLC when the average "IA Cores Power" is close to the average "CPU Core Power", and the VID are close to vcore on average,

So plug in IA DC LL = 1.1, look at the HWIFO64 and see if they match. It only needs to be close enough for the throttling limits to work properly.

[CypherBlaze1]

I've had my IA AC LL at .44, and IA DC LL also at .44 to match.

I've had my cpu clock ratio at 5.1, going down as low as 4.8 with TVB for when temps get high. My cache clock ratio is at 4.6 because that's where it's stable, but I'd like to go a little higher, to 4.8 (with ring down bin enabled). But if I put it higher than 4.6, the pc completely freezes whenever a heavy load STOPS, and I have to hard restart. My best guess is that it's causing too much of a voltage spike when the load stops, despite only being on LLC4. But that's just a guess and I'm not that experienced.

Would fixing this IA DC LL affect that, and somehow allow me to put the cache a little higher?

[geneo]

IA DC loadline does not affect processor voltages,  performance, or stability. It just affects the calculated voltage that the processor uses to determine when to throttle when power or voltage limits are exceeded. So no.

Higher cache frequency usually requires more VCCSA and/or Vcore.

[CypherBlaze1]

Got it. Thanks. Yeah I tried adding more and more voltage to get 4.8 cache stable, but it didn't help at all. Just increased my temps till eventually I had to back down the cpu clock. So yeah I guess I'll stick with 4.6 for the cache ratio

[CypherBlaze1]

Thank you so much for your help!

And thank you for the explanation as well. It's nice to know better how it works