What are the consequences of using a good RAM along with a old one?

What are the consequences of using a good RAM along with a old one? Ok , I am planning to buy a 1 GB RAM to supplement my computer's old 512 MB Ram . Is it advised to use it side by side ? I am sure the 512 MB RAM Is not exactly in good condition as it is 4 years old . Will it affect he performance ? Which is better - with both RAM's or the new RAM only
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Guest [Entry]

Your motherboard may not let you mix RAM sticks of different sizes. Check with the manufacturers recommendations.