What type of memory does the Deskpro EP DT 6450+ Model 6400 use?

It uses SDRAM DIMM memory modules.

What storage drives fit the HP Deskpro EP DT 6450+ Model 6400?

Compatible drive types: IDE / PATA 2.5" Drive.

Guaranteed-compatible SSD and hard-drive upgrades for the HP Deskpro EP DT 6450+ Model 6400, matched to its drive bays and slots.

Guaranteed-compatible SSD and hard-drive upgrades for the HP Deskpro EP DT 6450+ Model 6400 — 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 HP Deskpro EP DT 6450+ Model 6400, matched to its drive bays and slots.

Guaranteed-compatible SSD and hard-drive upgrades for the HP Deskpro EP DT 6450+ Model 6400 — 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.