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addw2 RAM speed limited to 2933 MHz (documentation says 3200 MHz) #211

@jacobgkau

Description

@jacobgkau
  • Model: addw2
  • BIOS version: 2023-09-08_42bf7a6 & 2022-11-21_b773ac6.
  • EC version: 2023-09-08_42bf7a6 & 2022-11-21_b773ac6.
  • OS: Pop!_OS 22.04
  • Kernel: 6.4.6-76060406

Tech docs list the addw2 as supporting up to 3200 MHz RAM, but it only runs at up to 2933 MHz (tested with 1x MNSO48E82-3200E in both slots individually and 2x Neo Forza NMSO432F82-3200EA00).

Steps to reproduce

Boot the machine & run sudo dmidecode -t 17.

Expected behavior

RAM runs at 3200 MHz.

Actual behavior

RAM runs at 2933 MHz.

Additional info

I can't seem to find the upstream Clevo manual for this system right now. I see in the addw1 Clevo manual that it was limited to 2666 MHz. If it turns out this is expected behavior, then I'll transfer this issue to the tech docs repo and fix it there.

This was discovered while testing the latest upcoming firmware update (2023-09-08_42bf7a6), but is not a regression from the current release (2022-11-21_b773ac6).

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