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The original was posted on /r/linux by /u/Comfortable-Sun1791 on 2023-08-15 01:45:03+00:00.

I have 4 memory stick installed in my computer, they are Cosair VENGEANCE® LPX 16GB DDR4 DRAM 2666MHz C16:

My OS is Ubuntu 18.04, the last part of the output of sudo dmidecode --type 17 is:

Handle 0x0028, DMI type 17, 40 bytes
Memory Device
        Array Handle: 0x000F
        Error Information Handle: 0x0027
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 16384 MB
        Form Factor: DIMM
        Set: None
        Locator: DIMM 1
        Bank Locator: P0 CHANNEL D
        Type: DDR4
        Type Detail: Synchronous Unbuffered (Unregistered)
        Speed: 2667 MT/s
        Manufacturer: Unknown
        Serial Number: 00000000
        Asset Tag: Not Specified
        Part Number: CM4X16GE2666C16K2
        Rank: 2
        Configured Clock Speed: 1333 MT/s
        Minimum Voltage: 1.2 V
        Maximum Voltage: 1.2 V
        Configured Voltage: 1.2 V

As you can see, the Configured Clock Speed is merely 1333MT/s, I suppose it should be 2666MT/s, am I right.

As a comparison, I’ve got another computer with Ubuntu 18.04, the output is as follows:

Handle 0x001A, DMI type 17, 84 bytes
Memory Device
        Array Handle: 0x0009
        Error Information Handle: 0x0019
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 16384 MB
        Form Factor: DIMM
        Set: None
        Locator: DIMM 1
        Bank Locator: P0 CHANNEL B
        Type: DDR4
        Type Detail: Synchronous Unbuffered (Unregistered)
        Speed: 2133 MT/s
        Manufacturer: Unknown
        Serial Number: 00000000
        Asset Tag: Not Specified
        Part Number: CM4X16GC3000C16K4D
        Rank: 2
        Configured Clock Speed: 2133 MT/s
        Minimum Voltage: 1.2 V
        Maximum Voltage: 1.2 V
        Configured Voltage: 1.2 V

Any ideas?