When using the dmidecode command, we can see the speed of RAM:

Speed: 2933 MHz


Configured Clock Speed: 2666 MHz

Which one is the currently running speed? Why are there two speed items?

1 Answer 1


In dmidecode’s output for memory, “Speed” is the highest speed supported by the DIMM, as determined by JEDEC SPD information. “Configured Clock Speed” is the speed at which it is currently running (as set up during boot).

The latter may be higher than the former, e.g. with DIMMs providing higher speeds described by Intel XMP profiles.

  • This is close, but not quite right, looking at a data sample right now someone posted, configured speed appears to the speed the system booted at, and speed is more of a default value, in this case, speed was 1333 MT/S, and configured speed 1600 MT/S. Could be overclocking, could be just an odd set of values, but 1600 was in this case the actual speed, faster than speed value.
    – Lizardx
    Dec 12, 2020 at 17:45
  • While providing details to a vendor for purchasing additional ram, may I depend dmidecode output ?
    – Arun
    Nov 26, 2021 at 1:05
  • 1
    @Arun the part number given by dmidecode can be trusted, and along with the manufacturer, will allow you to determine the exact characteristics of the installed memory. Nov 26, 2021 at 8:25

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