laptop memory slots
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I have a Laptop which had 4GB RAM first so it had single channel memory mode now my laptop has 2 slots only 1 is filled so i put 1 more same speed same specs ...
DIMM - Wikipedia
I understand that your laptop Lenovo IdeaPad Y510p has only 2 SODIMM slots but even tough in Task Manager its showing 4 memory slots.
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This means having a laptop with two memory slots, containing two memory modules of equal capacity and a processor that can support dual-channel.