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I'm wanting to update my existing 1GB Kinsgston 240 pin DIMM memory to 2GB or more. Can I keep my existing IGB and add another from a different manufacture? Will they match or should I just get new memory? What is available is DDR3 and DDR2. Guess what I'm asking is I have two memory slots total one will have the existing 1GB and I want to add at least 1GB more, does the DDR3 or DDR2 matter? Or is it all about the 240 pin config?
It matters. I would go to Crucial.com and use their tools to figure out what is best. (You don't have to buy from them, but they have some good tools available.) Some boards are really picky where both sticks have to be the same brand/make/model. Others aren't so picky. DDR2 and DDR3 are different, so make sure your board supports whichever one you get. I may be wrong, but I don't think you can mix DDR2 and DDR3, even if your board supports both.
In addition to the other good advice, memory has different speed and different timings. If you put two modules of DDR3 together your mainboard will clock them at one speed only.
Also, your motherboard manual is a great source of information.
For example my Gigabyte motherboard lists the slots and memory type and even has a "memory support list". This list shows a list of memory modules from different vendors that have been tried and tested.
It may be worth looking up if your motherboard has a similar list.
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