How much RAM does the Lenovo ThinkPad T420i 4178 support?

The ThinkPad T420i 4178 supports up to 8GB of memory across 2 slot(s), up to 4GB per slot.

What type of memory does the ThinkPad T420i 4178 use?

It uses DDR3 SODIMM memory modules.

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Lenovo ThinkPad T420i 4178Memory Upgrades

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System specifications for Lenovo ThinkPad T420i 4178

Specifications reported for the Lenovo ThinkPad T420i 4178.

Memory type: DDR3
Form factor: SODIMM
Memory slots: 2
Maximum memory: 8GB
Max per slot: 4GB
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 Lenovo ThinkPad T420i 4178, 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

Lenovo ThinkPad T420i 4178Memory Upgrades

Change system Auto-detect

6 guaranteed-fit options

This option is out of stock.

System specifications for Lenovo ThinkPad T420i 4178

Specifications reported for the Lenovo ThinkPad T420i 4178.

Memory type: DDR3
Form factor: SODIMM
Memory slots: 2
Maximum memory: 8GB
Max per slot: 4GB
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

Lenovo ThinkPad T420i 4178Memory Upgrades

Choose your upgrade

System specifications for Lenovo ThinkPad T420i 4178

Software

Lenovo ThinkPad T420i 4178Memory Upgrades

Choose your upgrade

System specifications for Lenovo ThinkPad T420i 4178

Software