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In majority of the cases, motherboard with quad channel memory support have 8 or more RAM slots.
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Why Does Your Motherboard Have Four RAM Slots? ... So, if the memory controller only receives data from two RAM sticks, why does a motherboard have four RAM slots?
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Let's say a consumer has a motherboard with 4 slots and each slot supports up to 16GB RAM. A typical consumer needs far less than 64GB RAM, so why should the consumer pay for more RAM than he needs.