Asus AM5 Motherboard Overvoltage issue

[burak1]

hi i am using asus tuf b650 plus wifi motherboard and latest 3035 bios.

when i set cpu voltage (vddsoc voltage overdrive) to 1.27 bios shows much more than 1.27 (like 1.295v, 1.304v etc.) 

i installed ryzen master to check the voltages. there it shows vddcr_soc 1.27 but in hwinfo it shows vddcr_soc voltage svi3 tfn 1.256 which is less than the value i set and cpu soc voltage shows 1.304v which is more than the value i set.

is my motherboard broken or is the bios broken or is it a general issue?

[Silent_Scone]

Hi @burak1 
I don't believe any B650 chipset boards have die-sense voltage measurements. This means that the reported VID may be higher than the actual real-world voltage. The SVI3 measurement is the internal CPU telemetry and is the most accurate sensor for this purpose.

[burak1]

hello, why does it show 1.256v in svi3 even though i entered 1.27 in bios? it doesnt make sense. and when i set soc voltage  1.27v why does asus set 1.304v ? isnt this more than the safe limit?

[Silent_Scone]

Hello,

It does make sense. The VID in BIOS and the real-time voltage are not the same. The voltage applied and the measurement in BIOS depends where the reading is tapped on the power plane.

As the differential sensing pins do not exist on your board for die sense, the measurement is taken further away and has to contend with resistance, so it may not necessarily follow the actual-voltage. SVI3 provides the internal telemetry for the CPU, so this is as close to source as you will get. Regardless of what is "set", SVI3 telemetry is what you can use for reference.

[burak1]

thanks for the answer again. i dont quite understand, english is not my mother tongue, are these voltages safe for 7800x3d because the maximum soc voltage limit for 7800x3d is 1.30v. 

currently my cpu soc voltage is 1.36v and svi3 voltage is 1.288. 

[Silent_Scone · Accepted solution]

The Novoton section refers to the motherboard's SuperIO controller. It uses socket sense to measure voltage, but as mentioned earlier, this method is less accurate because it's farther from the source. On higher-end X670 boards, die sense is used, which provides more accurate readings. As a result, the measurements from both the SuperIO and SVI3 telemetry should align more closely.

For accurate VSOC voltage measurement , you should rely on SVI3, as explained earlier. Hope this makes sense.