I have a Ryzen 5 1600AF (Zen+) and 2x 8 GB DDR4 3600 HyperX. when I select XMP1, it says 1.35V in the profile. however, when I boot Strelec WinPE USB (I’m on Fedora, I really don’t want to install windows just so I can run HWINFO), install all drivers and launch HWINFO64 it says 1.2V. so I enter BIOS again, go to Voltages and enter 1.35 manually instead of auto. no change, still reads 1.2V. the BIOS side screen shows 1.35 after reboot.

I’ve found an unresolved thread somewhere with the same problem for my board. I’m on latest BIOS.

am I missing something, is there some additional setting I need to switch so it registers? the BIOS setup is hella confusing and borderline stupid, e.g. enabling virtualization required turning on SMP (how am I supposed to guess what that is?!) that’s located in the “Frequency” subsection (wtf?!).

  • @SteveTechEnglish
    1•1 year ago

    If you open the sensors part of HWINFO there should be a DIMM voltage from the motherboard, that’s a live reading, what does that say?

    I’m on Fedora

    Here’s a few alternatives to HWINFO I’ve used:

    • CPU-X (has a GUI, and is probably the most like HWINFO but still different)
    • lm-sensors (might require a custom profile for your motherboard, but can provide live temp/fan/voltage sensor readings)
    • dmidecode (built in, can read the data off the dimm, but doesn’t read sensors directly)

    Edit: Just realised I have that motherboard, and it’s probably why XMP stopped being stable. I’ll look into it on Monday.

    Edit 2: From memory to use lm-sensors you need to use an updated it87 driver for both chips to appear, I can provide a sensors profile on Monday.

    • @[email protected]OPEnglish
      2•1 year ago

      CPU-X doesn’t list RAM voltages. sensors lists a buncha stuff (none labeled as DDR voltage) but all at 1.2V. dmidecode also lists 1.2V for all items, but I’ve read that its data is unreliable. I’ve tried already all the listed options (and then some) and that’s why I tried WinPE, as HWINFO64 is supposed to have methods to reliably determine RAM voltage.