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Crucial has made it pretty easy to find out what memory should be used in your system. However, if you don't know what system you have, or the make of your motherboard and are comfortable with looking inside your pc, do the following.
You can tell which kind you have by looking at one of the modules currently in your system. Count the number of black chips on one module. If the number of chips can be evenly divided by three or five, you should buy ECC or parity (whichever is offered for your system). If not, you should buy non-parity.
For example, if one of your modules has nine chips, you should buy ECC or parity. If one of your modules has eight chips, you should buy non-parity.