No memory upgrades are available for your HP - Compaq Vectra VL400 with 1000MHz processor Desktop/PC.

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device type: desktop

Your Vectra VL400 with 1000MHz processor 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: 512MB
Slots: 2

The system model shown may not match exactly to what you have. The System Scanner determined that the memory specifications match.

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 our support department.