dmidecode命令查看内存型号

目前我的电脑内存只有512M，想加根内存条。机器主板是nVidia Corporation MCP61,看了下主板说明

书发现系统内存支持双通道内存技术。配置了4个DDRII DIMM插槽，支持DDRII 800/667/533内存，

最大支持8G容量。

为了尝试下双通道内存技术，打算买根跟原来一样的内存条。发票的电脑配置上只写了kingston DDRII

512M。剩下的事情就是确定内存的工作频率。上网google发现有个工具dmidecode(DMI table

decoder)。它可以全面的显示你系统的信息，包括bios、cpu、内存等信息。

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[ray@localhost testcase]$ sudo dmidecode --help

Usage: dmidecode [OPTIONS]

Options are:

-d, --dev-mem FILE     Read memory from device FILE (default: /dev/mem)

-h, --help             Display this help text and exit

-q, --quiet            Less verbose output

-s, --string KEYWORD   Only display the value of the given DMI string

-t, --type TYPE        Only display the entries of given type

-u, --dump             Do not decode the entries

-V, --version          Display the version and exit

[ray@localhost testcase]$ sudo dmidecode -t memory

# dmidecode 2.7

SMBIOS 2.4 present.

Handle 0x0007, 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:

                70 ns

                60 ns

        Supported Memory Types:

                DIMM

                SDRAM

        Memory Module Voltage: 3.3 V

        Associated Memory Slots: 4

                0x0008

                0x0009

                0x000A

                0x000B

        Enabled Error Correcting Capabilities:

Handle 0x0008, DMI type 6, 12 bytes.

Memory Module Information

        Socket Designation: DIMM0

        Bank Connections: 0 1

        Current Speed: Unknown

        Type: ECC DIMM

        Installed Size: 512 MB (Single-bank Connection)

        Enabled Size: 512 MB (Single-bank Connection)

        Error Status: OK

Handle 0x0009, DMI type 6, 12 bytes.

        Socket Designation: DIMM1

        Bank Connections: None

        Type: Unknown

        Installed Size: Not Installed

        Enabled Size: Not Installed

Handle 0x000A, DMI type 6, 12 bytes.

        Socket Designation: DIMM2

Handle 0x000B, DMI type 6, 12 bytes.

        Socket Designation: DIMM3

Handle 0x0010, DMI type 16, 15 bytes.

Physical Memory Array

        Location: System Board Or Motherboard

        Use: System Memory

        Error Correction Type: None

        Maximum Capacity: 8 GB

        Error Information Handle: Not Provided

        Number Of Devices: 4

Handle 0x0012, DMI type 17, 27 bytes.

Memory Device

        Array Handle: 0x0010

        Total 64 bits

        Data 72 bits

        Size: 512 MB

        Form Factor: DIMM

        Set: None

        Locator: DIMM0

        Bank Locator: BANK0

        Type: DDR2

        Type Detail: Synchronous

        Speed: 533 MHz (1.9 ns)

        Manufacturer: Manufacturer0

        Serial Number: SerNum0

        Asset Tag: AssetTagNum0

        Part Number: PartNum0

Handle 0x0014, DMI type 17, 27 bytes.

        Total Unknown

        Data 64 bits

        Size: No Module Installed

        Locator: DIMM1

        Bank Locator: BANK1

        Type Detail: Unknown

        Speed: Unknown

        Manufacturer: Manufacturer1

        Serial Number: SerNum1

        Asset Tag: AssetTagNum1

        Part Number: PartNum1

Handle 0x0016, DMI type 17, 27 bytes.

        Locator: DIMM2

        Bank Locator: BANK2

        Manufacturer: Manufacturer2

        Serial Number: SerNum2

        Asset Tag: AssetTagNum2

        Part Number: PartNum2

Handle 0x0018, DMI type 17, 27 bytes.

        Locator: DIMM3

        Bank Locator: BANK3

        Manufacturer: Manufacturer3

        Serial Number: SerNum3

        Asset Tag: AssetTagNum3

        Part Number: PartNum3

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在Memory Controller Information中，可以看到最大的内存大小是8G，支持内存种类为DIMM和SDRAM。

有四个Memory Slots。对应接下来的4个Memory Module Information。DMI type 16 (man

dmidecode里面有DMI TYPES specification)的意思是 Physical Memory Array。 这里也可以看出来，

最大支持内存为8G， 有4个内存设备。最后则列出具体的4个内存设备，其中发现了一个内存设备为512M，

类型Type：DDR2， 工作频率Speed: 533 MHz (1.9 ns)。这个就我目前电脑上的那根内存条。