Lenovo ThinkPad T420 - RAM Upgrade Guide
The Lenovo T420 laptop has two memory slots available for RAM upgrades. It can support a maximum of 16GB of memory. The type of RAM compatible with this model is DDR3 SDRAM, and it uses a SODIMM format, which is a smaller version of the standard memory module designed for laptops. For optimal performance, the recommended clock speed for the RAM is 1333MHz, often labeled as PC3-10600.
Lenovo ThinkPad T420 Memory Specifications & Maximum RAM Capacity
| Specification | Value |
|---|---|
| Laptop Model | Lenovo ThinkPad T420 |
| Total memory slots | 2 |
| Maximum RAM | 16GB |
| Memory type | DDR3 SDRAM |
| Form factor | SODIMM (Small Outline Dual Inline Memory Module) |
| Recommended RAM clock speed | 1333MHz (PC3-10600) |
| Voltage | 1.35V - 1.5V |
| Number of pins | 204-pin |
FAQ about Lenovo ThinkPad T420 RAM
How much RAM can I put in a T420?
You can install up to 16GB total - that's 8GB per slot since it has 2 memory slots. Pretty decent for an older laptop.
What type of memory does the T420 use?
It uses DDR3 SODIMM modules - the smaller laptop-sized sticks, not the full-size desktop ones. Make sure you get SODIMMs or they won't fit.
What speed RAM should I get for the T420?
Go with 1333MHz (also labeled as PC3-10600). That's the recommended speed for this model. Faster RAM will work but will just run at 1333MHz anyway.
Can I mix different RAM sizes in my T420?
Yeah, you can mix sizes like 4GB + 8GB to get 12GB total. Just try to match the speed (1333MHz) if possible for best performance.
Do I need to upgrade both RAM slots at once?
Nope, you can upgrade one slot at a time. If you've got 4GB now, just add another stick in the empty slot or replace the existing one with a bigger module.
Will faster DDR3 like 1600MHz work in the T420?
It'll work fine but will automatically slow down to 1333MHz to match what the T420 supports. No harm done, just won't get the extra speed.