Bug in B660 bios cpu voltage offset

[MonstyB]

Hi MonstyB,
Do you have freezing issue at idle or only during boot?
Do you have the issue on bios 1603 with bios all default settings?
If you disable C-states in bios, does the freezing issue disappear?
May I have the serial number of your motherboard via PM?
Thank you.

Freezing mainly occurred at the beginning of boot process, when the windows loading spinner starts spinning.

I also had a freeze during shutdown, when I clicked "reboot" in windows. Windows tried to log me off but it froze instantly.

I'm gonna test with C states disabled (what about speedstep ?)

Everything was set to default in BIOS except RAM profile that is set to XMP (Corsair Vengeance 5600 CL36)

I will send you my motherboard's S/N in PM in a few minutes and keep this post updated with my results.

Thanks !

[MonstyB]

Okay so the results are interesting.

Disabling the C-States did stop freezing issues... but in this scenario, applying a negative core voltage offset sacrifices almost all the CPU's performance :'(

Here are the multi-thread results with CPU-Z (C-States disabled) :

No offset : 5100
-0.025V : 4000
-0.050V : 2500

How could the performance be that impacted by such a small undervolting ?

[MonstyB]

No offset / C-States disabled


-0.05V / C-States disabled


-0.01V (best offset with no freezes) / C-States enabled


Core voltage is higher with a negative offset

[trihy]

Also check your vcore on hwinfo.

Vid is not real vcore, it's just what the core ask for.

[STARRAIN@ROG]

Hi MonstyB,
Thank you for your reply.
Have you tried bios 1603 with bios all default settings(no OC and no XMP)? Did it also freeze at the beginning of boot process and during shutdown?
or it only freezes after adjust voltage offset?
Thank you.

[MonstyB]

I am using bios 1603.

It freezes during boot process only when adjusting core voltage offset.

I have juste made a test with -0.020V with everything else @stock, it froze when windows finished loading (so I guess it means voltage was too low when the CPU entered idle state)

This board would be perfect without this issue.

At the moment it sounds like a deal breaker for me

[trihy]

Bios 1620 was released today.

But bug still there. So keep using the beta one.

[MonstyB]

Too bad this beta bios does not exist for the ITX motherboardÂ*

[trihy]

It's just a matter of time until this fixes will come for every other board.

[MonstyB]

You're right, the bug is still there in 1620 bios, just tried it and had a crash at -0.015 as soon as Windows finished loading.