How much RAM does the Dell OptiPlex 990 (Small form factor) support?

The OptiPlex 990 (Small form factor) supports up to 16GB of memory across 4 slot(s), up to 4GB per slot.

What type of memory does the OptiPlex 990 (Small form factor) use?

It uses DDR3 DIMM memory modules.

Compatible drive types: SATA 2.5" SSD.

Guaranteed-compatible SSD and hard-drive upgrades for the Dell OptiPlex 990 (Small form factor), matched to its drive bays and slots.

Guaranteed-compatible SSD and hard-drive upgrades for the Dell OptiPlex 990 (Small form factor) — matched to its drive bays and slots.

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.

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Guaranteed-compatible SSD and hard-drive upgrades for the Dell OptiPlex 990 (Small form factor), matched to its drive bays and slots.

Guaranteed-compatible SSD and hard-drive upgrades for the Dell OptiPlex 990 (Small form factor) — matched to its drive bays and slots.

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.