Memory card – How does it work?

My notebook is a bit slow. I only have 4 gb of ram. So I want to upgrade it a bit.

First thing first. What do I have now?

sudo dmidecode --type memory

This gives us all the info we need about the current memory in out computer.

# dmidecode 3.0
Getting SMBIOS data from sysfs.
SMBIOS 2.8 present.

Handle 0x005B, DMI type 16, 23 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: 2

Handle 0x0060, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x005B
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 4096 MB
Form Factor: SODIMM
Set: None
Locator: DIMM A
Bank Locator: Not Specified
Type: DDR3
Type Detail: Synchronous
Speed: 1600 MHz
Manufacturer: Micron
Serial Number: CFC29B80
Asset Tag: 9876543210
Part Number: 8KTF31561HK-1G6E1
Rank: 1
Configured Clock Speed: 1600 MHz

Handle 0x0065, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x005B
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: DIMM B
Bank Locator: Not Specified
Type: Unknown
Type Detail: None
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Rank: Unknown
Configured Clock Speed: Unknown

In the first section we can see that the maximum-capacity of this computer is 16gb of memory and that the there is space for two devices. In other words, it has two slots for memory. So I guess I can add two 8gb of memory without problem.

Then it lists the current memories I have installed. As you can see I only have one memory installed, on the first slot. And it appears to be a 4gb memory. What is important to note here it the type. Is says here that it is a DDR3. So my new memory must be a DDR3, if cannot be DDR2 or DDR4. Motherboards are usually only able to support one memory-type.

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