Stuck on cpu+dram led unless I use a single

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If your motherboard supports 16 GB of RAM and has four slots, you can install four 4 GB sticks or two 8 GB sticks to reach your maximum

In other words, a single stick, will not operate in dual-channel mode There is no indication that 3 sticks is a supported configuration, but lshw -class memory tells you firmware, cache, and memory banks in detail IIRC, before my upgrade it reported bank:1 unused , and now it tells

slot machine games with real money Read your motherboard manual It will tell you which slots to insert ram It all depends on the motherboard and the type of channel For example running 3 sticks will make it single channel you must add 1 more or just run in single channel if you value capacity more than speed the