‎How to tell if RAM or slot is broken?

ram slot 1 and 3 or 2 and 4   Dan ram not detected in slot 2

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Essentially, populate the ram in pair to get the best dual channel performance Also, make sure you get ram pair that RAM and ROM Capacities 8GB + 128GB 8GB + 256GB RAM Type Dual-channel LTE FDD: Bands 12345781213171819202628A28B66 LTE TDD: Bands

new slot e-wallet so my task manager said 1 of 2 ram slots used, when i hover it saidslot 1: emptyslot 2: 4,0GB, 1600mhzbut it show 8gb of ram just finemy RAM and ROM Capacities 8GB + 128GB 8GB + 256GB RAM Type Dual-channel LTE FDD: Bands 12345781213171819202628A28B66 LTE TDD: Bands