Questions About Dual-Channel Memory

My laptop has 6gb of RAM. One 4gb stick and another 2gb stick. I've heard that in order to utilize "dual-channel" memory, both sticks have to be the same amount od memory. Is that true? I was thinking of ditching the 2gb stick for another 4gb to get a total of 8gb of RAM. I'm not necessarily considering it because I need more memory, but rather to get dual-channel support as I have heard that it provides a performance boost. What do you think I should do? Is there anything I should know before going out and buying another stick?
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More about questions dual channel memory
  1. max about 5% boost. Buy a matching stick.
  2. rolli59 said:
    max about 5% boost. Buy a matching stick.

    "Matching" as in brand, frequency, memory?
  3. Preferably, exactly those things Brand, speed, timings and voltage. Better yet a 2x 4GB dual channel kit.
  4. rolli59 said:
    Preferably, exactly those things Brand, speed, timings and voltage. Better yet a 2x 4GB dual channel kit.

    How much will that set me back?
  5. okay, cool! How do I know which speed of memory my laptop will support?
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