How much RAM does the ASUS RS521A-E12-RS12U support?

The RS521A-E12-RS12U supports up to 2048GB of memory across 24 slot(s), up to 85.3333GB per slot.

What type of memory does the RS521A-E12-RS12U use?

It uses DDR5 RDIMM memory modules.

Compatible drive types: NVMe M.2 22110 (PCIe Gen 4) SSD, NVMe M.2 2280 (PCIe Gen 4) SSD, SATA 2.5" Hard Drive, SATA 2.5" SSD.

Guaranteed-compatible SSD and hard-drive upgrades for the ASUS RS521A-E12-RS12U, matched to its drive bays and slots.

Verified compatible

Guaranteed-compatible SSD and hard-drive upgrades for the ASUS RS521A-E12-RS12U — matched to its drive bays and slots.

This option is out of stock.

Your slot's PCIe generation isn't published; the drive adjusts to it automatically.

This option is out of stock.

This option is out of stock.

The drive bay size is inferred from the system's reported storage interface.
Compatibility is based on published specifications, not yet confirmed against a manufacturer tool.

This option is out of stock.

Specifications reported for this system.

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Guaranteed-compatible SSD and hard-drive upgrades for the ASUS RS521A-E12-RS12U, matched to its drive bays and slots.

Verified compatible

Guaranteed-compatible SSD and hard-drive upgrades for the ASUS RS521A-E12-RS12U — matched to its drive bays and slots.

This option is out of stock.

Your slot's PCIe generation isn't published; the drive adjusts to it automatically.

This option is out of stock.

This option is out of stock.

The drive bay size is inferred from the system's reported storage interface.
Compatibility is based on published specifications, not yet confirmed against a manufacturer tool.

This option is out of stock.

Specifications reported for this system.