How much RAM does the HP TouchSmart 420-1155la support?

The TouchSmart 420-1155la supports up to 8GB of memory across 2 slot(s), up to 4GB per slot.

What type of memory does the TouchSmart 420-1155la use?

It uses DDR3 SODIMM memory modules.

Compatible drive types: SATA 2.5" SSD.

Guaranteed-compatible SSD and hard-drive upgrades for the HP TouchSmart 420-1155la, matched to its drive bays and slots.

Guaranteed-compatible SSD and hard-drive upgrades for the HP TouchSmart 420-1155la — 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 TouchSmart 420-1155la, matched to its drive bays and slots.

Guaranteed-compatible SSD and hard-drive upgrades for the HP TouchSmart 420-1155la — 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.