Most memory these days looks the same, is comes in fiberglass strips with notches on the side, desktop memory is about twice the size of laptop memory. There are quite a few words, phrases and acronyms that you should probably know before purchasing your memory. There is a stick for example, this is a piece of memory that really looks more like a strip, this is also called a module, then there are the sockets that hold the sticks, these are sometimes called banks. Free slots are open sockets that you can use to put memory in. Then there is laptop memory which is used quite obviously memory used in laptops.
Some of the less obvious terms include matched pairs when a computer says that you need to install memory in matched pairs, this means that you have to install two sticks of memory that are exactly the same kind at the same time. Not many computers require this, but if they do make sure you don't waste your money and buy two different sticks of memory. Then there are the different types of memory which include DDR SDRAM or DDR2 SDRAM, The higher the number the faster this memory goes, in most cases slower motherboards can handle quite a bit faster memory, but you never want to put slower memory on a faster motherboard because you'll just end up making your computer even slower which is really pretty counterproductive.
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