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    Screenshot of resource management is a requirement to properly diagnose this problem.
    – Ramhound
    Commented Oct 24, 2020 at 23:26
  • A screenshot from another system isn’t helpful. Please only provide information about your own system
    – Ramhound
    Commented Oct 25, 2020 at 13:42
  • Try to start at the "base" and set the speed of all RAM modules to 2666MHz (or disable memory OC) and check if all modules are found. Then you can step-by-step increase the frequency.
    – Robert
    Commented Oct 25, 2020 at 14:38
  • @Lion ... Please provide the needed specs for the combinations of RAM chips you have tried so that is more clear. Also check over msi.com/Motherboard/support/X570-A-PRO#support-mem-13 and maybe ensure the correct CPU is selected and then look over the QVL that also lists the DIMM slot configs, voltages, speed, chip size densities, etc. compatibility for the configuration you may need. It's gotta be configuration or compatibility issue. See if you can connect some dots with that resource for more things to try, update your question with DIMM specs afterwards please though. Commented Nov 7, 2020 at 20:19
  • Did you check the qvl to confirm your configuration for make and model, voltage, density, etc. is supported as the vendor documented known good configurations for the hardware and the 32 GB configuration you are after. Can you please simply add a list of all the DIMM chips you have with make, model, voltage, size, speed, etc. You have all 4 exactly the same all specs and brand or a mixture of 2 and 2 or what. The screen shots and notes aren't real clear. Please add an itemized list with those specs and I (or maybe others) might be able to help unless you already figured it out what's up here. Commented Nov 9, 2020 at 23:08