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As long as they're the same type (DDR2, DDR3). The speed of the RAM should either be the same or higher than your original since the computer matches all installed RAM to the lowest speed. e.g. my computer currently has a 2GB 800MHz DDR2 as well as a 1GB 667MHz DDR2. But the RAM is set to 667MHz and isn't utilising the full 800MHz on the 2GB.

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Q: When you upgrade RAM is it possible to buy a 4 GB kit and use it with an already installed 4 GB kit to get 8 GB RAM?
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Can you upgrade your laptop with new CPU or more RAM like desktops?

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