Mixing 2 different ram quantities and different brands can lead to bad things happening like blue screens. I would replace the old sticks with the new ones. It'll be impossible to tell a difference between 2.5 and 2 GB so it doesn't matter anyway.
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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