An exact match is ideal. However you can mix and match modules, if this is not obtainable.
To take the guess work out you could use something like Crucial Memory. They have a program that will scan your PC and offer fully compatible modules for your system.
If you mix and match modules the system will run all of them at the rate of the slowest module.
I do use 4 x matched modules at this time. In the past I have run systems with non matched modules, though matching pair modules in dual channel mode.
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