Single RAM but 4 dimms slot: where should i put?

imthebeginning003

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Jan 14, 2018
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RAM: Avexir 8gb 2400mhz
mobo: MSI b350 bazooka

4 dimms
blck(slot1) : white(slot2) : blck(slot3) : white(slot4)

Where should I put my single memory?