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02 Feb 2013  

Windows 7 Home Premium 64bit

You can mix RAM, but they have to be the same type and speed.(You already knew that) Keep your 4x2Gb RAM in the first slots and the 1Gb behind those. For "best" performance I would use RAM from the same manufacturer, this just guarntees that all the modules operate at exactly same spec. But you should be fine so long as they are all the same speed and type.
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