No memory upgrades are available for your HP - Compaq Presario 800S model CDS 866 Desktop/PC.

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device type: desktop

Your Presario 800S model CDS 866 System Specs

System specs as shipped by the manufacturer.
Scan your system to view your specific system configuration.

Memory:

Memory Type: ,  (non-ECC)
Maximum Memory: 64MB
Slots: 4

How much memory your Windows OS will recognize depends on which version of Windows you are running. 32-bit versions of Windows will see (and utilize) only 3GB or 3.5GB. To utilize more memory, install a 64-bit version of your OS. More information about OS memory maximums can be found here.

Memory or DRAM is the "working" memory of the computer. It's used to store data for programs (sequences of instructions) on a temporary basis.

video - installing memory

We're sorry.
Crucial currently does not have any compatible upgrades available for your particular system. If you have questions or would like further support, please contact us our support department.

For more assistance please call toll-free (US and Canada) at 800-336-8915. Our customer service hours are Monday through Friday, 7am - 6pm (MST). You can also chat with a memory expert during customer service hours and find a wealth of information at the Crucial Community forum and knowledge base.

Product information: