Task manager say 1 out of 2 slots in RAM

I understand that your laptop Lenovo IdeaPad Y510p has only 2 SODIMM slots but even tough in Task Manager its showing 4 memory slots In order

They typically come with 184 pins for desktops and 200 pins for SO-DIMM slots 2 DDR2 – DDR2 further doubled the

20 bulky fruits slot This resulted in twice the capacity of DIMM with the same quantity of RAM hence supporting the 64-bit processors While two SIMM sticks would be

24kbet slot It has only 1 memory slot