Bug in B660 bios cpu voltage offset

[trihy]

Hi. I made several tickets on Asus support but there is no way to make them understand the problem.

There is a bug on b660 bios, on all b660 boards. And all 600 series. On z690 is less visible cause there is adaptive voltage, which most people use. On b660 there is only offset.

Problem is, setting a CPU voltage offset of -0.005 will cause ramdon freeze at idle. As you increase the offset, the random freeze ratio will increase.

Also setting + offset will do the same.

This is because applying any offset will cause more than -0.200mv drop at idle.

This was happening on msi boards too and was fixed with a bios update.

Thread on msi forums https://forum-en.msi.com/index.php?threads/msi-b660-tomahawk-ddr4-cpu-core-voltage-offset.372022/



Please someone from Asus explain why cpu voltage drops to 0.300 or less when using default bios settings. Lowest per spec value is 0.700 for alder lake.

Thanks.

[MonstyB]

STARRAIN@ROG wrote:
Hi MonstyB,
Thank you for your reply.
May I have screenshots of multi-thread CPU-Z score?
- no offset adjustment on the 1620 beta bios
- negative offset of 0.025V on the 1620 beta bios
- negative offset of 0.025V on the 1620 formal bios(C-state disabled)
- negative offset of 0.025V on the 1620 formal bios(C-state enabled)
Thank you.

Here are the screenshots







As for -0.025V on the 1620 regular bios with C-States enabled, I cannot get Windows to boot, it freezes during loading

[crossbone]

I am having the same problem regarding unvervolting with my Strix B660I Gaming WiFi - as soon as I enter any negative offset, I keep getting crashes when booting up windows or shortly thereafter.

For sanity I checked the same CPU in a Z690 Board - no such problem over there. Must be a B660 Problem. I tried the latest 3 BIOSes (1601-Beta, 1603 and 1620)

When can we expect a fix for this?

[STARRAIN]

Hi crossbone,
Do you have the freezing/crashing issue on bios 1620 with bios all default settings(no OC)?
If you disable C-states in bios, does the freezing/crashing issue disappear?
May I have the serial number of your motherboard via PM?
Thank you.

[STARRAIN]

Hi MonstyB,
Our tech team would like to have the specific screenshot to compare the performance you mentioned.
Could you please help to share the screenshots? so that I can forward them to our tech team for further checking.
Thank you so much.

[MonstyB]

I have not had access to my computer for a few days

I will take the screenshots tomorrow.

[STARRAIN]

Hi MonstyB,
We will wait your screenshots.
Thank you for your help.

[STARRAIN]

Hi MonstyB,
Thank you for your screenshots and information.
I'll forward them to our tech team for further checking.
Could you please help to check your PM inbox?
Thank you.

[MonstyB]

STARRAIN@ROG wrote:
Hi MonstyB,
Thank you for your screenshots and information.
I'll forward them to our tech team for further checking.
Could you please help to check your PM inbox?
Thank you.

Thank you, I have answered your question

[STARRAIN]

Hi MonstyB,
Thank you for your answer.
I'll get back to you if there is any news from our tech team.

[MonstyB]

Hello, any update on this ?

Just so you know, I've been experimenting negative offset on a ROG Strix B660-G + i3 12100f (bios 1620) with no issues whatsoever ! Offset is working as expected, the CPU can take -0.100v without any loss of performance.
So maybe... to fix the B660-I, take exemple on what is done on the B660-G ?

Regards