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I have a SONY VAIO VGN-NS325J laptop with 3GB RAM. Can I just add a 4GB and have 7GB? Or do I have to have 2 of the same RAM sticks? I have not tried anything yet.

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    Try it and see if it works. Some motherboards are finiky about different RAM sticks and others are not. it shouldn't hurt anything to try. But, just because you install it and it doesn't cause a problem doesn't mean it is using it. Go to Control Panel >> System and see how much installed memory is listed. – Linger Sep 6 '13 at 17:53
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    I would check the specification on the laptop. Sony makes this information known in the specification. It all depends on the motherboard they used. – Ramhound Sep 6 '13 at 18:29
  • Note that you would only get the benefit of having more than 4GB of memory if you had a 64-bit system. – Doktoro Reichard Sep 6 '13 at 21:00
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You'll have to find out what type of RAM your laptop supports before trying to install another stick of RAM. If you download CPU-Z and click on the Memory tab it'll tell you the type of RAM your laptop is using, its DRAM Frequency (You'll have to multiply it by 2 to get the actually frequency as DDR stands for Dual Data Rate) and the RAM timings.

The bit you need to be concerned with is the type of RAM (e.g. DDR2, DDR3, etc). You'll have to get the supported type. If you buy a 4GB stick of the same type with the same Timings and DRAM Frequency you should be fine. If the frequency and/or timings are different, you may run into problems, leading you to having to go into your BIOS settings and tinkering with the RAM settings. I'm sure you don't want to do this, so it's better if you purchase RAM with properties that match.

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Your laptop has two memory slots which can contain a maximum of 4 GB each. You probably have one 2GB and one 1 GB card. Your cheapest option would be to replace the 1 GB with 4 GB.

You can use one of the memory providers' websites to scan your computer and show upgrade options. For example Crucial.

Note that you must be running a 64bit operating system to use more than 4 GB.

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