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8 guaranteed-fit options
Matched to this machine's drive bays and slots.
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This option is out of stock.
Specifications reported for the HP 6400.
Free tools from Seifelden — no purchase needed.
Checks the drivers on your HP 6400, installs the safe updates Windows offers, guides the rest to the official download — and confirms exactly which of the upgrades above your machine has room for.
Free Upgrade Assistant
Confirms which of these upgrades your machine has room for.