因为机器正在跑，而且机器很多，如何不关机登录过去看内存条是ddr2的还是ddr3的，linux下。解决马上给分。。虽然有点晚了。
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playmud:~$ sudo dmidecode -t memory
# dmidecode 2.9
SMBIOS 2.5 present.
Handle 0x1000, 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 0x1100, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 2048 MB
Form Factor: DIMM
Set: None
Locator: DIMM_1
Bank Locator: Not Specified
Type: DDR2
Type Detail: Synchronous
Speed: 800 MHz (1.2 ns)
Manufacturer: 7F4F000000000000
Serial Number: 00031BB4
Asset Tag: 540811
Part Number: JM800QLU-2G