目前我的電腦內存只有512M，想加根內存條。機器主板是nVidia Corporation MCP61,看了下主板說明書發(fā)現系統(tǒng)內存支持雙通道內存技術。配置了4個DDRII DIMM插槽，支持DDRII 800/667/533內存，最大支持8G容量。
為了嘗試下雙通道內存技術，打算買根跟原來一樣的內存條。發(fā)票的電腦配置上只寫了kingston DDRII 512M。剩下的事情就是確定內存的工作頻率。上網google發(fā)現有個工具dmidecode(DMI table decoder)。它可以全面的顯示你系統(tǒng)的信息，包括bios、cpu、內存等信息。
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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:
None
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.
Memory Module Information
Socket Designation: DIMM1
Bank Connections: None
Current Speed: Unknown
Type: Unknown
Installed Size: Not Installed
Enabled Size: Not Installed
Error Status: OK
Handle 0x000A, DMI type 6, 12 bytes.
Memory Module Information
Socket Designation: DIMM2
Bank Connections: None
Current Speed: Unknown
Type: Unknown
Installed Size: Not Installed
Enabled Size: Not Installed
Error Status: OK
Handle 0x000B, DMI type 6, 12 bytes.
Memory Module Information
Socket Designation: DIMM3
Bank Connections: None
Current Speed: Unknown
Type: Unknown
Installed Size: Not Installed
Enabled Size: Not Installed
Error Status: OK
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
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 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.
Memory Device
Array Handle: 0x0010
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: 64 bits
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
Handle 0x0016, DMI type 17, 27 bytes.
Memory Device
Array Handle: 0x0010
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: 64 bits
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: DIMM2
Bank Locator: BANK2
Type: Unknown
Type Detail: Unknown
Speed: Unknown
Manufacturer: Manufacturer2
Serial Number: SerNum2
Asset Tag: AssetTagNum2
Part Number: PartNum2
Handle 0x0018, DMI type 17, 27 bytes.
Memory Device
Array Handle: 0x0010
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: 64 bits
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
?。Y束操作－－－－－－－－－－－－－－－－－－－－－－－－－
在Memory Controller Information中，可以看到最大的內存大小是8G，支持內存種類為DIMM和SDRAM。
有四個Memory Slots。對應接下來的4個Memory Module Information。DMI type 16 (mandmidecode里面有DMI TYPES specification)的意思是 Physical Memory Array。 這里也可以看出來，最大支持內存為8G， 有4個內存設備。最后則列出具體的4個內存設備，其中發(fā)現了一個內存設備為512M，類型Type：DDR2， 工作頻率Speed: 533 MHz (1.9 ns)。這個就我目前電腦上的那根內存條。
關鍵詞標簽：dmidecode
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