Consult your notebook specifications or Maintenance and Service Guide for installed memory information. Go to the HP product support homepage for your computer model, and then select the Product Information category for the specifications document, or select User Guides for the Maintenance and Service Guide. Or in the Search field at the top of this page, type your product number, a space, and either specifications or maintenance and service guide (Example: RQ877AS specifications).
In the Maintenance and Service Guide, consult the Memory section for memory module specifications, memory module spare part numbers, compatible processors and types of RAM, and the number of memory slots.
In the notebook specifications document consult the Memory section for the following information.
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Amount of memory installed: Check the current amount of memory installed on your computer, and then go to the Verify how much memory you can add section in this document.
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Maximum memory supported: Subtract the amount of memory already installed from the maximum amount supported by the system to determine how much memory to purchase. You can also buy the maximum amount allowed and replace the currently installed memory. Then go to the Confirm the maximum memory supported by your Windows version section in this document. Use the lower of these two numbers as your maximum memory.
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Type of memory (including speed): HP recommends purchasing the same type of memory (same size, speed, and manufacturer) for each slot. For the best performance, purchase the fastest memory the motherboard supports.
caution:
Some motherboards are not able to configure memory modules with different manufacturers, or different CAS or density values. To ensure your memory is compatible, make sure all SO-DIMMs have the same part number.