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已安装 8GB RAM，可用仅显示 4GB

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已安装 8GB RAM，可用仅显示 4GB

我在电脑上安装了 8GB 的​​ RAM（2x4GB）。之前我只有 4GB（1x4GB），我将新卡安装在最旧的位置，将另一张安装在相同类型的另一个插槽中。但是如果我检查 Ubuntu 的详细信息或 htop，它只显示 4GB（3'8GB）。我的主板是华硕 P7H55-M。在 Windows 中，它检测到 8GB，但它说只能使用 4GB，不知道为什么。这是我的输出。（有西班牙语）

免费-h：

             total       usado       libre     compart.    búffers 
    almac.
Mem:          3,8G       2,2G       1,6G        18M       119M       869M
-/+ buffers/cache:       1,2G       2,6G
Intercambio:       4,5G         0B       4,5G

sudo dmidecode——类型内存：

SMBIOS 2.6 present.

Handle 0x0008, DMI type 5, 24 bytes
Memory Controller Information
    Error Detecting Method: 64-bit ECC
    Error Correcting Capabilities:
        None
    Supported Interleave: One-way Interleave
    Current Interleave: One-way Interleave
    Maximum Memory Module Size: 2048 MB
    Maximum Total Memory Size: 8192 MB
    Supported Speeds:
        Other
    Supported Memory Types:
        DIMM
        SDRAM
    Memory Module Voltage: 3.3 V
    Associated Memory Slots: 4
        0x0009
        0x000A
        0x000B
        0x000C
    Enabled Error Correcting Capabilities:
        None

Handle 0x0009, DMI type 6, 12 bytes
Memory Module Information
    Socket Designation: DIMM0
    Bank Connections: 0 1
    Current Speed: Unknown
    Type: DIMM SDRAM
    Installed Size: 4096 MB (Double-bank Connection)
    Enabled Size: 4096 MB (Double-bank Connection)
    Error Status: OK

Handle 0x000A, DMI type 6, 12 bytes
Memory Module Information
    Socket Designation: DIMM1
    Bank Connections: 2 3
    Current Speed: Unknown
    Type: DIMM SDRAM
    Installed Size: Not Installed
    Enabled Size: Not Installed
    Error Status: OK

Handle 0x000B, DMI type 6, 12 bytes
Memory Module Information
    Socket Designation: DIMM2
    Bank Connections: 4 5
    Current Speed: Unknown
    Type: DIMM SDRAM
    Installed Size: 4096 MB (Double-bank Connection)
    Enabled Size: 4096 MB (Double-bank Connection)
    Error Status: OK

Handle 0x000C, DMI type 6, 12 bytes
Memory Module Information
    Socket Designation: DIMM3
    Bank Connections: 6 7
    Current Speed: Unknown
    Type: DIMM SDRAM
    Installed Size: Not Installed
    Enabled Size: Not Installed
    Error Status: OK

Handle 0x0036, DMI type 16, 15 bytes
Physical Memory Array
    Location: System Board Or Motherboard
    Use: System Memory
    Error Correction Type: None
    Maximum Capacity: 16 GB
    Error Information Handle: Not Provided
    Number Of Devices: 4

Handle 0x0038, DMI type 17, 28 bytes
Memory Device
    Array Handle: 0x0036
    Error Information Handle: Not Provided
    Total Width: 64 bits
    Data Width: 64 bits
    Size: 4096 MB
    Form Factor: DIMM
    Set: None
    Locator: DIMM0
    Bank Locator: BANK0
    Type: DDR
    Type Detail: Synchronous
    Speed: 1333 MHz
    Manufacturer: Manufacturer0
    Serial Number: SerNum0
    Asset Tag: AssetTagNum0
    Part Number: PartNum0
    Rank: Unknown

Handle 0x003A, DMI type 17, 28 bytes
Memory Device
    Array Handle: 0x0036
    Error Information Handle: Not Provided
    Total Width: Unknown
    Data Width: Unknown
    Size: No Module Installed
    Form Factor: DIMM
    Set: None
    Locator: DIMM1
    Bank Locator: BANK1
    Type: Unknown
    Type Detail: Unknown
    Speed: Unknown
    Manufacturer: Manufacturer1
    Serial Number: SerNum1
    Asset Tag: AssetTagNum1
    Part Number: PartNum1
    Rank: Unknown

Handle 0x003C, DMI type 17, 28 bytes
Memory Device
    Array Handle: 0x0036
    Error Information Handle: Not Provided
    Total Width: 64 bits
    Data Width: 64 bits
    Size: 4096 MB
    Form Factor: DIMM
    Set: None
    Locator: DIMM2
    Bank Locator: BANK2
    Type: DDR
    Type Detail: Synchronous
    Speed: 1333 MHz
    Manufacturer: Manufacturer2
    Serial Number: SerNum2
    Asset Tag: AssetTagNum2
    Part Number: PartNum2
    Rank: Unknown

Handle 0x003E, DMI type 17, 28 bytes
Memory Device
    Array Handle: 0x0036
    Error Information Handle: Not Provided
    Total Width: Unknown
    Data Width: Unknown
    Size: No Module Installed
    Form Factor: DIMM
    Set: None
    Locator: DIMM3
    Bank Locator: BANK3
    Type: Unknown
    Type Detail: Unknown
    Speed: Unknown
    Manufacturer: Manufacturer3
    Serial Number: SerNum3
    Asset Tag: AssetTagNum3
    Part Number: PartNum3
    Rank: Unknown

通过 dmicoded 可以得知有两块 4GB 的 RAM。

而且，显然我使用的是 64 位内核：

Linux m0skva 3.13.0-53-generic #89-Ubuntu SMP Wed May 20 10:34:39 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

BIOS 内存重映射已启用。我不知道还能做什么。

答案1

内存控制器信息
最大内存模块大小：2048 MB

上面输出的这一部分将解释您所看到的内容。您能否确认所用的主板，或检查每个 DIMM 可接受的最大容量？

答案2

分享我的经验：我整天都在为这个问题而苦苦挣扎。就我而言，我意识到问题出在我技嘉主板上的蓝色和白色插槽上。一旦我将 4GB 内存条放入相同颜色的插槽（蓝色），一切就都解决了 :)

答案3

尝试匹配您的插槽，以便每对反映相同的速度和棍棒制造商。

检查您的 CPU 速度。进入 BIOS 并降低速度以适应最慢的内存。您可能需要通过低于规格的速度进行测试，以达到全内存正常工作的程度。

在您拥有一个可运行的配置之后，当然，如果它能通过减慢处理速度来工作，那么请投资将最慢的棒更改为更快的棒。

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