MSI B660 Tomahawk DDR4 - CPU Core Voltage Offset

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Jan 29, 2022
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I have a problem with my MSI B660 Tomahawk DDR4, namely "Core Voltage Offset".
Set it to (-), then "0.010" on the offset, and it refused to boot, only clear CMOS helps.
Set it to (+), then "0.010" on the offset, and it dropped the CPU voltage to about 0.640 in BIOS from 0.840, and BSOD when getting into Windows.
BIOS 2.10, and BETA BIOS 2.22, both tested.
Can other users test this and confirm?
Thank you

EDIT:
Forgot to add, i7-12700F processor
 

MechDragon

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I have i7 12700 and B660 Tomahawk ddr4.
Tried yesterday offsets -0.050 and -0.010 and the system could no longer boot and I had to clear CMOS. Looks like a bug to me.
I also do not understand why 0.840 VCORE is shown in the BIOS for i7 12700 non-K. I saw a photo of BIOS with i7 12700k (also in MSI B660 Tomahawk DDR4), but VCORE was 1.116.
Is 12700 already highly undervolted? Does not look like it. In games and becnhmarks, I see that the voltage is about 1.26. Then why in bios it is 0.840.
 
Last edited:
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Thank you for confirming, seems offset setting is definitely broken since (+) setting resulted in less than idle voltage (0.640v in mine).
As for the 0.840v in BIOS, its the idle voltage for 2.1Ghz (12700 non-K), the K processor idled at 3.2Ghz, so its higher on idle than non-K.
Can you also try the (+) setting..?
 

MechDragon

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Tried +0.010
BIOS: loaded, VCORE 0.640, BIOS UI is slow and unresponsive
Windows: not loaded
 

Svet

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Have a try this new .222 BIOS:
that should solve this issue with the offset.
 
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Have a try this new .222 BIOS:
that should solve this issue with the offset.
Sorry for the late reply, swamped with work.
Yes, this works, but its a little weird, I don't know if its the expected behaviour or not...

I set my 12700F to PL1=PL2=125w.
With everything Auto, I got this voltage reading...

Idle 0.724v
CB23 1.070v
With a score of ~20k

With Offset +0.050, I got this...

Idle 0.774v -> Correct offset
CB23 1.094v -> Higher than Auto, so maybe correct
With a score of ~20k (slightly lower than Auto)

This is where it gets interesting. With Offset -0.050, I got this...
Idle 0.678v-> Correct offset
CB23 1.150v -> MUCH higher than Auto
With a score of ~13k -> I cannot explain this MUCH lower score

=================


I was expecting an idle voltage around 0.678v, and a load voltage around 1.020v (lower than 1.070v at Auto)
Any guess whats happening..?
 
Last edited:

rawcell

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Feb 19, 2022
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I have a problem with my MSI B660 Tomahawk DDR4, namely "Core Voltage Offset".
Set it to (-), then "0.010" on the offset, and it refused to boot, only clear CMOS helps.
Set it to (+), then "0.010" on the offset, and it dropped the CPU voltage to about 0.640 in BIOS from 0.840, and BSOD when getting into Windows.
BIOS 2.10, and BETA BIOS 2.22, both tested.
Can other users test this and confirm?
Thank you

EDIT:
Forgot to add, i7-12700F processor
this issue also appears on my B660M WiFi DDR4 Mortar board. any of the BIOS versions on the board's BIOS page has this issue. I hope a fix gets released for the Mortar boards as well. :(

Edit (added specs):
i5-12400F
MAG B660M Mortar WiFi DDR4
BIOS ver .124 (BIOS Page says Beta)
 

MechDragon

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Instead of adjusting the offset, you can try to set CPU Lite Load Control to mode 1.
For me it reduced temperatures, voltage and consumption good enough. Also no degradation in performance and runs stably.
 
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Instead of adjusting the offset, you can try to set CPU Lite Load Control to mode 1.
For me it reduced temperatures, voltage and consumption good enough. Also no degradation in performance and runs stably.
I tested CPU Lite Load Control, starting at Mode 9...
At Mode 5, CB23 resulted in a shocking 9700 points, and max load of 109w...
Around 100w load should give me ~19000 points...
I'm quite shocked by the result, so I didn't try any further... :oops:

I assume you didn't set PL1/PL2, unlocked at 288w/4096w?
 
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MechDragon

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I tested CPU Lite Load Control, starting at Mode 9...
At Mode 5, CB23 resulted in a shocking 9700 points, and max load of 109w...
Around 100w load should give me ~19000 points...
I'm quite shocked by the result, so I didn't try any further... :oops:

I assume you didn't set PL1/PL2, unlocked at 288w/4096w?
I chose in the BIOS that I have an air tower cooler and it's already automatically 288w or something like that.
With Mode 1 I got ~21500 points in CB23. Max temp was 63-65. Im using NH-D15s with an single fan.

EDIT: The PC worked stably all day, but in the evening Total War: 3K crashed.
Then I ran the prime95 small FFTs stress test and after a few seconds got a BSOD :D
I will try modes 2-3.

EDIT2: Strange results:
CPU Lite Load Mode 1 - CB23 ~21500 points
CPU Lite Load Mode 2 - CB23 ~9000 points
CPU Lite Load Mode 7 - CB23 ~12000 points
 
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I chose in the BIOS that I have an air tower cooler and it's already automatically 288w or something like that.
With Mode 1 I got ~21500 points in CB23. Max temp was 63-65. Im using NH-D15s with an single fan.
Yup, thats unlocked/unlimited, since the 12700 maxed at 180w.
I limit it to 125w, and I wanted to lower the voltage more, thats why I can only use Offset Mode...

EDIT2: Strange results:
CPU Lite Load Mode 1 - CB23 ~21500 points
CPU Lite Load Mode 2 - CB23 ~9000 points
CPU Lite Load Mode 7 - CB23 ~12000 points
Yup, I told ya its weird... ;)
That's why I won't bother with it...
 

ychinghi155e02dc

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Feb 21, 2022
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Same issue here.
Specs:
12900F
MAG B660M Mortar DDR4
BIOS version 7D42v11

Can't boot the system whenever I change the offset.

I also tested the CPU Lite Load Control.
At auto I got ~22000 with PL1=PL2=140w,
but at mode 2, I got ~11000 points in CB23 which is weird.
 

rawcell

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Instead of adjusting the offset, you can try to set CPU Lite Load Control to mode 1.
For me it reduced temperatures, voltage and consumption good enough. Also no degradation in performance and runs stably.
i've done that as well, and it only reduced my temps by a degree at best. it's still disappointing that this is a known issue, and is even resolved in the tomahawk series. it's just a matter of waiting at this point. it can't stop me from being disappointed, no? otherwise, it's a great product and i'm still thankful that this is the board i chose, versus the other options i had here from where i am from.
 

DragonCentaur

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Any update on this guys? Undervolting on B660 Mortar/Tomahawk still buggy as above, or is there hope MSI will support it properly?
 

plutomate

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which problem is that exactly? which BIOS version you're using?
 

rawcell

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Any update on this guys? Undervolting on B660 Mortar/Tomahawk still buggy as above, or is there hope MSI will support it properly?
I was able to undervolt properly with the new v12 BIOS for the Mortar DDR4 WiFi, released around a couple of weeks ago. The old BETA BIOS (v122, released January) did not work properly, but is now removed. The previous issue of changing to offset mode drops the starting voltage to ~0.650v is not happening anymore.
 
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I was able to undervolt properly with the new v12 BIOS for the Mortar DDR4 WiFi, released around a couple of weeks ago. The old BETA BIOS (v122, released January) did not work properly, but is now removed. The previous issue of changing to offset mode drops the starting voltage to ~0.650v is not happening anymore.
Wow, really..?
I don't have access to the PC right now.
That's good news.
 

wpwentzel15e602ea

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Apr 12, 2022
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Same issue here.
Specs:
12900F
MAG B660M Mortar DDR4
BIOS version 7D42v11

Can't boot the system whenever I change the offset.

I also tested the CPU Lite Load Control.
At auto I got ~22000 with PL1=PL2=140w,
but at mode 2, I got ~11000 points in CB23 which is weird.
How are you setting PL1 and PL2 on this board? Mine are stuck on "Auto," I cannot seem to change the PL1 and PL2 values (i7 12700).
 
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