眼镜 -
CPU - Ryzen 5 2400G
Motherboard - MSI B450 gaming plus
RAM - Corsair Vengeance 8GB x 2
I am Using two displays - HDMI && DVI
我安装了 ubuntu 18.04，它显示只有 13.7GB 内存，总共 16GB
当我只使用一根内存条时，它显示 8GB 中有 5.8GB
我使用的是 Windows，内存有 14+GB
sudo dmidecode -t memory
输出
# dmidecode 3.1
Getting SMBIOS data from sysfs.
SMBIOS 2.8 present.
Handle 0x000F, DMI type 16, 23 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: None
Maximum Capacity: 256 GB
Error Information Handle: 0x000E
Number Of Devices: 4
Handle 0x0016, DMI type 17, 40 bytes
Memory Device
Array Handle: 0x000F
Error Information Handle: 0x0015
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: 2133 MT/s
Manufacturer: Unknown
Serial Number: Unknown
Asset Tag: Not Specified
Part Number: Unknown
Rank: Unknown
Configured Clock Speed: Unknown
Minimum Voltage: Unknown
Maximum Voltage: Unknown
Configured Voltage: Unknown
Handle 0x0018, DMI type 17, 40 bytes
Memory Device
Array Handle: 0x000F
Error Information Handle: 0x0017
Total Width: 64 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: DIMM
Set: None
Locator: DIMM 1
Bank Locator: P0 CHANNEL A
Type: DDR4
Type Detail: Synchronous Unbuffered (Unregistered)
Speed: 2133 MT/s
Manufacturer: Unknown
Serial Number: 00000000
Asset Tag: Not Specified
Part Number: CMK8GX4M1D3000C16
Rank: 1
Configured Clock Speed: 1067 MT/s
Minimum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Configured Voltage: 1.2 V
Handle 0x001B, DMI type 17, 40 bytes
Memory Device
Array Handle: 0x000F
Error Information Handle: 0x001A
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: Unknown
Set: None
Locator: DIMM 0
Bank Locator: P0 CHANNEL B
Type: Unknown
Type Detail: Unknown
Speed: 2133 MT/s
Manufacturer: Unknown
Serial Number: Unknown
Asset Tag: Not Specified
Part Number: Unknown
Rank: Unknown
Configured Clock Speed: Unknown
Minimum Voltage: Unknown
Maximum Voltage: Unknown
Configured Voltage: Unknown
Handle 0x001D, DMI type 17, 40 bytes
Memory Device
Array Handle: 0x000F
Error Information Handle: 0x001C
Total Width: 64 bits
Data Width: 64 bits
Size: 8192 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: CMK8GX4M1D3000C16
Rank: 1
Configured Clock Speed: 1067 MT/s
Minimum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Configured Voltage: 1.2 V
答案1
可能需要检查 BIOS 上外围设备中的“集成显卡设置”（我的主板是技嘉主板，MSI 上的设置可能有所不同）。此设置控制分配给 2400G 上 GPU 的 RAM 量，当在我的主板上设置为自动时，它会分配大约 2 GB 的 RAM。当考虑到所有开销时，我的 2x8（16 Gb）RAM 还剩下大约 13.9 GB。如果您有独立于 2400G 的专用 GPU 单元，则可以通过此 BIOS 设置强制 RAM 更小。在我的设备上，我发现集成显卡设置上的“自动”可提供最佳的整体性能，因为我没有单独的视频卡。