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This question already has an answer here:

I have Dell XPS 15 laptop with two RAMs:

  • Samsung 4GB
  • Corsair 8GB CMSO8GX3M1A1333C9

    DDR3-1333/PC3-10600

    SO-DIMM Memory Module

    204-pin Configuration

    9-9-9-24 CAS Latency

Both these running fine for at least an year. Now I want to remove 4GB RAM and buy another 8GB one by Corsair. But this one is a bit different model. The specs are as below:

  • Corsair 8GB CMSO8GX3M1A1600C11

    DDR3-1600/PC3-12800

    SO-DIMM Memory Module

    204-pin Configuration

    9-9-9-24 CAS Latency

So the only difference between Two corsair's is that the one I currently have is DDR3-1333/PC3-10600, while the one which I am planning to buy is DDR3-1600/PC3-12800. Will these work together well in dual channel?

marked as duplicate by Ramhound, a CVn, CharlieRB, Sathyajith Bhat Jun 23 '15 at 16:24

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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The faster (1600) RAM will be ran at the lower RAM's speed (1333). You can read up on this on Wikipedia. Source

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