How much RAM does the ASRock Rack D1521D4I support?

The Rack D1521D4I supports up to 128GB of memory across 4 slot(s), up to 32GB per slot.

What type of memory does the Rack D1521D4I use?

It uses DDR4 DIMM memory modules.

Guaranteed-compatible DDR4 DIMM upgrades for the ASRock Rack D1521D4I, in matched-kit options that fill your slots.

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.
Compatibility is based on published specifications, not yet confirmed against a manufacturer tool.

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Guaranteed-compatible DDR4 DIMM upgrades for the ASRock Rack D1521D4I, in matched-kit options that fill your slots.

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.
Compatibility is based on published specifications, not yet confirmed against a manufacturer tool.