[dmidecode] dmidecode 3.2 shows strange memory Total Width

[Axel Rau]

Hi all,

I have a new install of Ryzen 7 3700X on a Asrock X470D4U motherboard.
The OS is FreeBSD 12.1.
I try to find out, if ECC enabled.

On a Xeon E5 CPU, dmidecode shows Total Width: 72 bits und Data Width: 64 bits.
72-64=8; These are the 8 parity bits.
The Ryzen CPU shows Total Width von 128 Bit und Data Width: 64 bits.

Is this a bug in the Bios or in demidecode or is ECC not enabled?

Thanks, Ajr

PS: I get:
root@b5:~ # dmidecode  -t memory
# dmidecode 3.2
# SMBIOS entry point at 0xed2b3000
Found SMBIOS entry point in EFI, reading table from /dev/mem.
SMBIOS 3.2 present.

Handle 0x000F, DMI type 16, 23 bytes
Physical Memory Array
    Location: System Board Or Motherboard
    Use: System Memory
    Error Correction Type: Multi-bit ECC
    Maximum Capacity: 128 GB
    Error Information Handle: 0x000E
    Number Of Devices: 4

Handle 0x0017, DMI type 17, 84 bytes
Memory Device
    Array Handle: 0x000F
    Error Information Handle: 0x0016
    Total Width: 128 bits
    Data Width: 64 bits
    Size: 16384 MB
    Form Factor: DIMM
    Set: None
    Locator: DIMM 0
    Bank Locator: P0 CHANNEL A
    Type: DDR4
    Type Detail: Synchronous Unbuffered (Unregistered)
    Speed: 2666 MT/s
    Manufacturer: Kingston
    Serial Number: E72F267D
    Asset Tag: Not Specified
    Part Number: 9965745-002.A00G
    Rank: 2
    Configured Memory Speed: 2400 MT/s
    Minimum Voltage: 1.2 V
    Maximum Voltage: 1.2 V
    Configured Voltage: 1.2 V
    Memory Technology: DRAM
    Memory Operating Mode Capability: Volatile memory
    Firmware Version: Unknown
    Module Manufacturer ID: Bank 2, Hex 0x98
    Module Product ID: Unknown
    Memory Subsystem Controller Manufacturer ID: Unknown
    Memory Subsystem Controller Product ID: Unknown
    Non-Volatile Size: None
    Volatile Size: 16 kB
    Cache Size: None
    Logical Size: None
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PGP-Key: CDE74120  ☀  computing @ chaos claudius

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