Lets assume your processor has two memory controllers and each memory controller is connected to two memory slots, for four slots total. If you have one stick of RAM, you’re using one memory controller. If you’re using two sticks of RAM, you can read data from memory twice as quickly, provided you put the two sticks in slots connected to different memory controllers. If you put both sticks of RAM in slots connected to the same controller, you’re throwing away performance, because one controller is going unused.
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