> IBM Memory > IBM ThinkPad Laptop Memory
Memory Upgrade for IBM ThinkPad T420i
IBM ThinkPad T420i memory upgrade specification, ThinkPad T420i maximum memory, memory speed, and memory upgrade options.
Upgrade memory on IBM ThinkPad T420i upto a maximum of 8GB
PC3-10666 DDR3-1333 204pin SDRAM SODIMM, with maximum 4GB per slot in 2 (2 banks of 1) memory slots. The IBM ThinkPad T420i takes the PC3-10666 DDR3-1333 204pin SDRAM SODIMM Memory Type.
| IBM ThinkPad T420i Memory Upgrade Specification | ||||
|---|---|---|---|---|
| Standard Memory | Maximum Memory | Memory Expansion | CPU Type | Model/Chipset |
| 1GB | 8GB PC3-10666 DDR3-1333 204pin SDRAM SODIMM |
2 (2 banks of 1) | - Intel Core i3 Processor Intel QM67 Chipset |
|
IBM ThinkPad T420i Memory Upgrade options.
What are memory sockets or slots and how are these divided into bank?
Memory Sockets or Slots are the place where memory RAM modules are inserted in the motherboard. The IBM ThinkPad T420i has 2 (2 banks of 1) memory expansion slots. A memory bank is a group of memory expansion sockets, a bank must be completely filled with memory modules of the same size and type in order for the system to recognize and address the memory. i.e. :
2 sockets (2 banks of 1) This indicates that there are 2 memory slots. These are divided into 2 banks, and each bank consists of one memory slot. So you can add memory one piece at a time for the system to use.
3 sockets (3 banks of 1) This indicates that there are 3 memory slots. These are divided into 3 banks, and each bank consists of one memory slot. So you can add memory one piece at a time for the system to use.
4 sockets (2 banks of 2) This indicates that there are 4 memory slots. These are divided into 2 banks, and each bank consists of two memory slots. So you must add memory two pieces at a time (they must be the same size and type of memory) in order for the system to benefit from the upgrade.
8 sockets (4 banks of 2) This indicates that there are 8 memory slots. These are divided into 4 banks, and each bank consists of two memory slots. So you must add memory two pieces at a time (they must be the same size and type of memory) in order for the system to benefit from the upgrade.
12 sockets (3 banks of 4) This indicates that there are 12 memory slots. These are divided into 3 banks, and each bank consists of four memory slots. So you must add memory four pieces at a time (and they must be the same size and type of memory) in order for the system to benefit from the upgrade.
