it DOES matter. not all ram companies make their ram the same, and that can cause problems. Be safe, get the same kind of ram you already have. Unless you want to ditch the ram you already have and throw in some new ram. Don't mix ram brands, theres a good chance you might run into problems, better off just playing it safe.
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There are only 10 kinds of people in this world. Those who can read binary, and those who can't.