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Old January 3rd, 2020, 03:56 PM
Digerati Digerati is offline
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Join Date: Jan 2007
Location: Nebraska, USA
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They must match the same type. For example, you cannot mix DDR3 and DDR4. Besides the fact the slots are physically different, they are not compatible.

Beyond that, they should match in the remaining specs to ensure compatibility and optimal performance. But typically they don't have to.

In your case, you have 4GB, "in theory" you could add an 8GB stick and end up with 12GB total. Or add 2GB and end up with 6GB. As long as the motherboard supports them they "should" work fine together. The only downside is they would not work in "dual-channel" memory mode. But typically just having more RAM would still improve performance even if operating in single-channel mode.

I note your user manual on page 1 clearly shows a list of single, matched pairs, and mixed pairs of RAM sticks. So no, they "should" not need to match to work - "in theory".

But note I say "in theory" and "should". This is because in theory and real world do not always jive. So to ensure the best odds, it typically is best to make sure all sticks are the same brand and model numbers. This is especially true with older hardware.

In your case, you have the advantage of having other sticks from similar computers at your disposal. I say as long as they are compatible DDR3, try them and see what happens.

Just remember to unplug from the wall, remove the battery and observe proper ESD precautions BEFORE reaching into your computer or touching any of the sticks.
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