我刚刚组装了一台新电脑，并安装了 1 个 16GB 盘，但我的系统报告它只有 8GB 可用。
输出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
输出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
输出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
输出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
所以如果我没看错的话，系统会看到 Device-2 上安装了 16GB 盘，但只有 8 个被视为 RAM。