Ryzen 5900x - odd CPU Core Voltage (SVI2 TFN Readings)

thewiredsoul

New Member
Have a 5900x installed in a MSI X570 Unify, since the latest BIOS update i have been getting very high CPU Core SVI2 TFN readings:

1619766179598.png

Never reads a dip below 1.4.

MB Vcore:
1619766217193.png

Ryzen Master shows the voltage regularly dropping down below 1.0, sometimes much lower as does CPU-Z.

Not sure if this is a MB specific problem.
 

Martin

HWiNFO Author
Staff member
Try to enable the "Snapshot CPU Polling" option in HWiNFO, that might better reflect low power states and idle mode.
 

thewiredsoul

New Member
Okay, just not sure which tool to trust, want to make sure its not sitting at that voltage constantly. I will try reverting to old bios (though i get usb errors then), thanks for the info.
 

Martin

HWiNFO Author
Staff member
AFAIK Ryzen Master does some "magic" with the voltage reported. There's only a single voltage supplied to the CPU which is the SVI2 TFN value shown in HWiNFO. But RM does some averaging to this - most likely somehow accounts for idle states (C-State residency). IMO the value shown in RM is not a real voltage.
 

Zach

Well-Known Member
I wouldn’t call this a fix. It shouldn’t behave like this. The CPU should fall to low power stages/voltage with CPPC features enabled.
By disabling CPPC you made at least Windows agnostic of the best and worst cores. I’m not sure if this can affect overall boosting too.

Do you have the latest BIOS for your board? Also, latest chipset drivers from AMD drivers download website and Windows 10 (20H2) to latest version?

What Windows power plan are/were you using?
 

inkforze

New Member
I wouldn’t call this a fix. It shouldn’t behave like this. The CPU should fall to low power stages/voltage with CPPC features enabled.
By disabling CPPC you made at least Windows agnostic of the best and worst cores. I’m not sure if this can affect overall boosting too.

Do you have the latest BIOS for your board? Also, latest chipset drivers from AMD drivers download website and Windows 10 (20H2) to latest version?

What Windows power plan are/were you using?
at least this "fix" return "normal" behavior (for me)

spec:
Win10 pro 21H1 (19043.1023)
Balanced power plan (5% min cpu state, modern power option slider on mid value - default)
Ryzen 5800X
B550 Tomahawk latest non-beta bios (agesa 1.2.0.2)
Latest chipset drivers from amd site (2.13.27.501)

find this options by: reset bios to default - and disable cpu features one by one
some users on reddit confirm this behavior on other systems
 

Zach

Well-Known Member
I see...
The power plan is Windows default balanced or Ryzen balanced?

I would also try the 1usmus universal power plan for Ryzen. I’m using this (v1.1) for a about 1.5year.
It is specifically designed for the CPPC features of ZEN2 initially but also applies to ZEN3.

Both links are very interesting reads

Technical background and download of v1.0

Follow up... and v1.1

It requires some BIOS settings

  • Global C-state Control = Enabled
  • Power Supply Idle Control = Low Current Idle
  • CPPC = Enabled
  • CPPC Preferred Cores = Enabled
  • AMD Cool'n'Quiet = Enabled
  • PPC Adjustment = PState 0
 

inkforze

New Member
1. windows default balanced
2. idle voltage and freq drop must work on any power plan with allowed power saving features (like default windows balanced)
3. i just inform author of post and any other interested in this issue of possible workaround
 

thewiredsoul

New Member
I would point out the the power plans you linked are for Ryzen 3000, not really supposed to need them for Ryzen 5000. This really seems like a MSI specific problem.
 
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