16GB RAMがインストールされていますが、システムに8GB RAMが表示されるのはなぜですか？

新しいコンピュータを作成して16GBドライブを取り付けたところ、システムで利用可能な容量が8GBしかないと報告します。

出力inxi -m：

Memory:
  RAM: total: 7.23 GiB used: 3.51 GiB (48.5%)
  Array-1: capacity: 32 GiB slots: 2 EC: None
  Device-1: DIMM 0 type: no module installed
  Device-2: DIMM 0 type: DDR4 size: 16 GiB speed: 2133 MT/s

出力free -h：

               total        used        free      shared  buff/cache   available
Mem:           7,2Gi       3,2Gi       2,5Gi        88Mi       1,5Gi       3,7Gi
Swap:          8,8Gi          0B       8,8Gi

出力uname -a：

Linux garnet-arch 5.15.41-1-MANJARO #1 SMP PREEMPT Wed May 18 09:20:01 UTC 2022 x86_64 GNU/Linux

出力dmidecode --type 17：

Getting SMBIOS data from sysfs.
SMBIOS 3.2.0 present.

Handle 0x0025, DMI type 17, 84 bytes
Memory Device
    Array Handle: 0x001E
    Error Information Handle: 0x0024
    Total Width: Unknown
    Data Width: Unknown
    Size: No Module Installed
    Form Factor: Unknown
    Set: None
    Locator: DIMM 0
    Bank Locator: P0 CHANNEL A
    Type: Unknown
    Type Detail: Unknown
    Speed: Unknown
    Manufacturer: Unknown
    Serial Number: Unknown
    Asset Tag: Not Specified
    Part Number: Unknown
    Rank: Unknown
    Configured Memory Speed: Unknown
    Minimum Voltage: Unknown
    Maximum Voltage: Unknown
    Configured Voltage: Unknown
    Memory Technology: Unknown
    Memory Operating Mode Capability: Unknown
    Firmware Version: Unknown
    Module Manufacturer ID: Unknown
    Module Product ID: Unknown
    Memory Subsystem Controller Manufacturer ID: Unknown
    Memory Subsystem Controller Product ID: Unknown
    Non-Volatile Size: None
    Volatile Size: None
    Cache Size: None
    Logical Size: None

Handle 0x0027, DMI type 17, 84 bytes
Memory Device
    Array Handle: 0x001E
    Error Information Handle: 0x0026
    Total Width: 64 bits
    Data Width: 64 bits
    Size: 16 GB
    Form Factor: SODIMM
    Set: None
    Locator: DIMM 0
    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: CMSO16GX4M1A2133C15 
    Rank: 2
    Configured Memory Speed: 2133 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 3, Hex 0x9E
    Module Product ID: Unknown
    Memory Subsystem Controller Manufacturer ID: Unknown
    Memory Subsystem Controller Product ID: Unknown
    Non-Volatile Size: None
    Volatile Size: 16 GB
    Cache Size: None
    Logical Size: None

したがって、正しく読み取ると、システムはDevice-2にインストールされている16 GBのディスクを見ることができますが、RAMは8 GBだけと見なされます。