b460 mortar voltage options


New member
Sep 16, 2020
I've bought this board and I must say I'm really impressed by the value/price performance. Pair with an i9 10900 it's a very a good platform wich give you free performance without effort with the power limit trick.

If possible I would like to see more vcore options to undervolt the cpu on next bioses release. Whit Intel XTU I can undervolt the cpu at values not present on the bios (-0.05v max on bios).

These locked cpus don't push the silicon to the limits and so we can go away withs less volt and mantain the max speed with less cooling effort. And I think it would be nice to have an options to undervolt the cpu only when all cores are turbo: the offset undervolt can infact go too lower when the cpu is idle.
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It seems that "CPU Lite Load" on bios does exactly what I want, lowering the vcore when all core are turbo. Default was mode_8 and I've set mode_1. (and I've reset vcore to auto)
Where can i find more info on how it works and the difference between this and other type of undervolting?
Yes, "CPU Lite Load" is the way to go. But Mode 1 applies the lowest voltage, which can be unstable. The default value will be quite high, to be able to run the worst silicon (highest VCore required in testing) without stability issues. But most CPUs have better silicon quality and you can go lower, decreasing power draw. Instability can easily be tested in Linpack Xtreme. For my 9600KF, it was unstable at CPU Lite Load 3, while 4 was stable, then for additoonal headroom, i went to 5. Rock stable and less power draw than the default.

CPU Lite Load is basically the "silicon quality" setting, they are testing hundreds of CPUs for the variance in quality, i.e. how high of a VCore is required for stability, and then they put in a default value like 8 or even 11, to be able to run 99.9% of the CPUs of varying VCore requirements. If you lower the setting, you are fine-tuning it down, to be more exact to your specific CPU. But you must ensure that it is Linpack-stable.

Linpack Xtreme: https://www.techpowerup.com/download/linpack-xtreme/

Run Linpack, select 2 (Stress test), 5 (10 GB), set 30 times, press Y to use all threads, and let it do its thing.
It's by far the best tool to detect instability, reacts even quicker than Prime95 and MUCH quicker than OCCT.

You can also run the Win10 memory diagnostic. Should take maybe 20 minutes or so and weeds out basic RAM errors.

For CPU temps and power draw, get CoreTemp: https://www.alcpu.com/CoreTemp/
Note the leftmost "Power" number and note the max temps.

Here are a few more things for power saving: https://forum-en.msi.com/index.php?...s-after-looking-for-help.345165/#post-1997577

Another important thing for these CPUs are the PL1, PL2 and Tau (Power limits) in the BIOS.

I know for the 10900K, they are PL1 = 125W, PL2 = 250W and Tau for PL2 = 56 seconds. So for a minute, the CPU is allowed to draw 250W. Most mainboard makers will probably allow PL2 all the time, like they did in the past. It's quite rare that a BIOS leaves the choice up to you, like on ASUS:


There's another important value, the EWMA, Exponentially Weighted Moving Average. This determines how long the CPU can remain in PL2, if it previously had full load already. Otherwise, with just a brief idle period, the CPU could draw 250W over and over again for the full Tau time. So the EWMA will make sure that after longer full load, even with some idle time in between, it can't go right back to PL2 for the full Tau time. Of course this all depends on PL1 and PL2 and Tau being correctly set in the BIOS. Otherwise, the CPU can draw however much it wants.
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Thank you for your reply! I will do some test with Linpack Xtreme and report
P1 and P2 are already to the max :D, I've bought this motherboard specifically for these features and the generous vrm section
Ok, I've tested my i9 10900 with Linpack Xtreme. Give me error with "CPU Lite Load" Mode 1 after 7-8 round. Vcore dropped to 1.044v min, power package was around 160W max.
With Mode 2 test passed: Vcore min 1.058v, power package 173W max. Also Windows Memory Diagnostic passed.
All tested in a silence-optimized case with ambient temp of 26C. Vcore voltage was set to auto and all the others voltages were manually set to default.
My cooler is and old Prolimatech Megahalems with a Scythe pwm 1300rpm fan, not a high-end air cooler by today's standards, but I'm happy with the results.

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Very nice result. Your CPU is quite good if it's already stable at CPU Lite Load 2!
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hi, i did combine an undervolt with [adpative + offset] plus [CPu Lite Load] setted to 9(was 11).

adpative + offset = -0.080V
Cpu Lite Load = 9

The system is stable.

Is any issue use this type of undervolting ?
If the system is 100% stable, then it's all good. Although i would use either one or the other.

Were you unable to go lower than CPU Lite Load mode 9 or what prompted you to also undervolt conventionally?
i saw this thread when i searching for a best undervolting setting for msi z390 gaming plus. I very like low temp / small power usage a almost same performance as stock, here i dicovered the "CPU lite load setting".

Before this i used the traditional undervolting with (adaptive + offset) so i tried add another step of undervolting with cpu load lite.

At moment i set to 8(was 11).
Mode 7 is the preview stable value, i choose mode 8 for a safe headroom.

Short story: I use -0.080V offset | CPU Lite Load mode 8