How much RAM does the Lenovo ThinkPad P16s Gen 1 21BU support?

The ThinkPad P16s Gen 1 21BU supports up to 48GB of memory across 1 slot(s), up to 48GB per slot.

What type of memory does the ThinkPad P16s Gen 1 21BU use?

It uses DDR4 SODIMM memory modules.

Guaranteed-compatible DDR4 SODIMM upgrades for the Lenovo ThinkPad P16s Gen 1 21BU, in matched-kit options that fill your slots.

Good to know

Maximum capacity per slot is inferred from total capacity ÷ number of slots.
This model has some on-board (soldered) memory in addition to its upgrade slot(s).
Compatibility is based on published specifications, not yet confirmed against a manufacturer tool.

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Guaranteed-compatible DDR4 SODIMM upgrades for the Lenovo ThinkPad P16s Gen 1 21BU, in matched-kit options that fill your slots.

Good to know

Maximum capacity per slot is inferred from total capacity ÷ number of slots.
This model has some on-board (soldered) memory in addition to its upgrade slot(s).
Compatibility is based on published specifications, not yet confirmed against a manufacturer tool.