Ubuntu Check RAM Memory Chip Speed and Specification From Within a Linux System

I want to add more RAM to my server running Ubuntu Linux. How do I find out my current RAM chip information such as its speed, type and manufacturer name within a Linux system without opening the case?

You need to use the dmidecode command which is a tool for dumping a computer's DMI (some say SMBIOS) table contents in a human-readable format. This table contains a description of the system's hardware components (such as RAM), as well as other useful pieces of information such as serial numbers and BIOS revision. Thanks to this table, you can retrieve hardware information without having to probe for the actual hardware. Open a command-line terminal (select Applications > Accessories > Terminal), and then type:
$ sudo dmidecode --type memory
OR
# dmidecode --type memory | less
OR
$ sudo dmidecode --type 17
Sample outputs:

# dmidecode 2.10
SMBIOS version fixup (2.51 -> 2.6).
SMBIOS 2.6 present.
Handle 0x0011, DMI type 16, 15 bytes
Physical Memory Array
 Location: System Board Or Motherboard
 Use: System Memory
 Error Correction Type: None
 Maximum Capacity: 4 GB
 Error Information Handle: Not Provided
 Number Of Devices: 4
Handle 0x0012, DMI type 17, 27 bytes
Memory Device
 Array Handle: 0x0011
 Error Information Handle: No Error
 Total Width: 72 bits
 Data Width: 64 bits
 Size: 2048 MB
 Form Factor: DIMM
 Set: 1
 Locator: DIMM#1A
 Bank Locator: Bank 1
 Type: DDR2
 Type Detail: Synchronous
 Speed: 667 MHz
 Manufacturer: Not Specified
 Serial Number: Not Specified
 Asset Tag: Not Specified
 Part Number: Not Specified
Handle 0x0013, DMI type 17, 27 bytes
Memory Device
 Array Handle: 0x0011
 Error Information Handle: No Error
 Total Width: 72 bits
 Data Width: 64 bits
 Size: 2048 MB
 Form Factor: DIMM
 Set: 1
 Locator: DIMM#2A
 Bank Locator: Bank 2
 Type: DDR2
 Type Detail: Synchronous
 Speed: 667 MHz
 Manufacturer: Not Specified
 Serial Number: Not Specified
 Asset Tag: Not Specified
 Part Number: Not Specified
Handle 0x0014, DMI type 17, 27 bytes
Memory Device
 Array Handle: 0x0011
 Error Information Handle: No Error
 Total Width: 72 bits
 Data Width: 64 bits
 Size: 2048 MB
 Form Factor: DIMM
 Set: 1
 Locator: DIMM#1B
 Bank Locator: Bank 1
 Type: DDR2
 Type Detail: Synchronous
 Speed: 667 MHz
 Manufacturer: Not Specified
 Serial Number: Not Specified
 Asset Tag: Not Specified
 Part Number: Not Specified
Handle 0x0015, DMI type 17, 27 bytes
Memory Device
 Array Handle: 0x0011
 Error Information Handle: No Error
 Total Width: 72 bits
 Data Width: 64 bits
 Size: 2048 MB
 Form Factor: DIMM
 Set: 1
 Locator: DIMM#2B
 Bank Locator: Bank 2
 Type: DDR2
 Type Detail: Synchronous
 Speed: 667 MHz
 Manufacturer: Not Specified
 Serial Number: Not Specified
 Asset Tag: Not Specified
 Part Number: Not Specified