Lenovo ThinkBook 15 G4 IAP

Type 21DJ Laptop, from 2022 16 hardware reports
Memory
Up to 40 GB
1 laptop-size slot + soldered
SSD and charger
Coming next
Checked from separate sources
Partly soldered

Yes, you can add one stick. Up to 40 GB seen working.

8 GB is soldered to the board and one slot is free for a DDR4-3200 laptop-size stick.

Free slots
1 SO-DIMM slot
Type
DDR4-3200 260-pin SO-DIMM
Soldered
8 GB
Most seen working
40 GB in two or more machines
Firmware says
128 GB maximum (often wrong, so we show what machines run)
How sure
16 of 16 reports show this layout
See 32 GB DDR4-3200 SO-DIMM on AmazonOpens an Amazon search for this exact spec.

Worked out from 16 hardware reports of this laptop. Sources and method. Updated 9 Nov 2026.

1 laptop-size slot plus soldered memory
Illustration

Questions

Can I upgrade the RAM in the Lenovo ThinkBook 15 G4 IAP?

Yes, you can add one stick. Up to 40 GB seen working. 8 GB is soldered to the board and one slot is free for a DDR4-3200 laptop-size stick.

What type of RAM does the Lenovo ThinkBook 15 G4 IAP use?

DDR4-3200 laptop-size sticks (SO-DIMM, 260-pin).

How much RAM can the Lenovo ThinkBook 15 G4 IAP take?

Machines in the reports run up to 40 GB. The firmware reports a maximum of 128 GB, a figure that is often wrong.

Is this my laptop?

Check the label on the bottom. It should say ThinkBook 15 G4 IAP, and the type code starts with 21DJ.

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