Using 667mhz and 800mhz

I currently use a stick of 1GB DDR2 667mhz and two sticks of 512MB 667mhz RAM in my current system (2GB total).
If I were take all of these out and put 2 sticks of 1GB 800mhz in there instead would I be able to use any of the 667mhz RAM? If so, would it be worthwilfe or should I just sell the old 667mhz on Ebay? My motherboard supports both types of RAM

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More about using 667mhz 800mhz
  1. Your board will clock all your memory to match the slowest part. Also, to run in dual channel mode (on most boards) you have to install memory in pairs.
  2. Thanks for your response. Would I be better off having the two 1GB sticks running at 800mhz than the two 1GB sticks and the two 512mb sticks running at 667mhz??

  3. Definately. Even if the 800Mhz sticks were only running at 667MHz, the benefit of running in dual channel mode would be worth it. Other than that, you probably would not notice a big difference between 667MHz dual channel and 800MHz dual channel, especially if your bus speed is 1066MHz or 1333MHz, since the 1:1 FSB:DRAM ratio would have your memory running at 667MHz or slower anyway.
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