F5F Stay Refreshed Hardware Desktop Discussing the voltage sensor CPU 1P8 at 1.838V in the B550 MSI Gaming Carbon setup.

Discussing the voltage sensor CPU 1P8 at 1.838V in the B550 MSI Gaming Carbon setup.

Discussing the voltage sensor CPU 1P8 at 1.838V in the B550 MSI Gaming Carbon setup.

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iron_finder1
Posting Freak
750
04-28-2020, 02:06 PM
#1
Do you have any idea about this sensor? It seems to operate at a very high voltage, and I’m not sure where it’s coming from. I also have another sensor that consistently reads 216ºC, but I know that wouldn’t be monitoring anything useful—otherwise the whole setup would be dangerous. This one keeps showing 1.836v and 1.840v in the system info, labeled VTT. MSI_SnapShot.bmp
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iron_finder1
04-28-2020, 02:06 PM #1

Do you have any idea about this sensor? It seems to operate at a very high voltage, and I’m not sure where it’s coming from. I also have another sensor that consistently reads 216ºC, but I know that wouldn’t be monitoring anything useful—otherwise the whole setup would be dangerous. This one keeps showing 1.836v and 1.840v in the system info, labeled VTT. MSI_SnapShot.bmp

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centdix
Member
156
04-28-2020, 11:38 PM
#2
It's tracking PLL performance. Typical PLL operates near 1.8V, with 1.9V being the commonly agreed upper bound. It can reach up to 2.1V or more and helps maintain stable high BCLK. This level is well beyond VTT limits, which are typically around half of DRAM voltage.
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centdix
04-28-2020, 11:38 PM #2

It's tracking PLL performance. Typical PLL operates near 1.8V, with 1.9V being the commonly agreed upper bound. It can reach up to 2.1V or more and helps maintain stable high BCLK. This level is well beyond VTT limits, which are typically around half of DRAM voltage.

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MidgetOnRoids
Member
64
04-29-2020, 04:01 AM
#3
Yes, that's correct. If it's PLL, it's acceptable at 1.840.
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MidgetOnRoids
04-29-2020, 04:01 AM #3

Yes, that's correct. If it's PLL, it's acceptable at 1.840.

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FLB1976
Member
235
04-29-2020, 05:29 AM
#4
Sure, just make sure to go into the BIOS and confirm the PLL voltage setting. It looks odd that HWINFO assigned an incorrect label. You might want to reinstall it to check if the issue gets fixed.
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FLB1976
04-29-2020, 05:29 AM #4

Sure, just make sure to go into the BIOS and confirm the PLL voltage setting. It looks odd that HWINFO assigned an incorrect label. You might want to reinstall it to check if the issue gets fixed.

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gitty12
Member
94
04-29-2020, 05:50 AM
#5
The board sensor indicates CPU 1P8. You can adjust the PLL manually at 1.8V to verify, as shown in your screenshot. Note: PLL isn't listed among the voltage settings. Updated January 15, 2021 by Kaldor Draigo
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gitty12
04-29-2020, 05:50 AM #5

The board sensor indicates CPU 1P8. You can adjust the PLL manually at 1.8V to verify, as shown in your screenshot. Note: PLL isn't listed among the voltage settings. Updated January 15, 2021 by Kaldor Draigo

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OTGDoesGaming
Junior Member
14
05-02-2020, 10:49 PM
#6
Did you check the OC Menu under CPU Voltages and search for labels like 1P8" or PLL? You might need to change from Normal to Expert mode. I looked in the manual for PLL information, but it wasn’t mentioned. It probably isn’t a major issue, but getting comfortable with your BIOS is still a good idea.
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OTGDoesGaming
05-02-2020, 10:49 PM #6

Did you check the OC Menu under CPU Voltages and search for labels like 1P8" or PLL? You might need to change from Normal to Expert mode. I looked in the manual for PLL information, but it wasn’t mentioned. It probably isn’t a major issue, but getting comfortable with your BIOS is still a good idea.

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Hidekih
Posting Freak
849
05-04-2020, 12:37 AM
#7
Yeah, I didn't see anything of the sort in the advanced mode. I had already looked at voltages previously when I used the new AGESA bios to undervolt with PBO and didn't see anything with that name (unless it has an alternative name). Neither is 1P8, that one only appears in the sensors when I go to the fans settings in the BIOS.
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Hidekih
05-04-2020, 12:37 AM #7

Yeah, I didn't see anything of the sort in the advanced mode. I had already looked at voltages previously when I used the new AGESA bios to undervolt with PBO and didn't see anything with that name (unless it has an alternative name). Neither is 1P8, that one only appears in the sensors when I go to the fans settings in the BIOS.