How much RAM does the IBM ThinkPad T420s support?

The ThinkPad T420s supports up to 16GB of memory across 2 slot(s), up to 8GB per slot.

What type of memory does the ThinkPad T420s use?

It uses DDR3 SODIMM memory modules.

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IBM ThinkPad T420sMemory Upgrades

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System specifications for IBM ThinkPad T420s

Specifications reported for the IBM ThinkPad T420s.

Memory type: DDR3
Form factor: SODIMM
Memory slots: 2
Maximum memory: 16GB
Max per slot: 8GB
Rated speed: 1333 MT/s
ECC: none

Good to know

Faster modules automatically run at your system's maximum supported speed.
Maximum capacity per slot is inferred from total capacity ÷ number of slots.

Software

Free tools from Seifelden — no purchase needed.

Seifelden Upgrade AssistantFree

Checks the drivers on your IBM ThinkPad T420s, installs the safe updates Windows offers, guides the rest to the official download — and confirms exactly which of the upgrades above your machine has room for.

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Your system

IBM ThinkPad T420sMemory Upgrades

Change system Auto-detect

8 guaranteed-fit options

This option is out of stock.

System specifications for IBM ThinkPad T420s

Specifications reported for the IBM ThinkPad T420s.

Memory type: DDR3
Form factor: SODIMM
Memory slots: 2
Maximum memory: 16GB
Max per slot: 8GB
Rated speed: 1333 MT/s
ECC: none

Good to know

Faster modules automatically run at your system's maximum supported speed.
Maximum capacity per slot is inferred from total capacity ÷ number of slots.

Software

Free tools from Seifelden — no purchase needed.

Seifelden Upgrade AssistantFree

IBM ThinkPad T420sMemory Upgrades

Choose your upgrade

System specifications for IBM ThinkPad T420s

Software

IBM ThinkPad T420sMemory Upgrades

Choose your upgrade

System specifications for IBM ThinkPad T420s

Software