won't use all ram

Forum discussion tagged with won't use all ram.
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    [SOLVED] My PC only allows me to use 8gb out of 16gb installed ram, help.

    I'm using a 2017-2018-ish prebuilt gaming pc, ASUSTek Computer Inc. AMD Ryzen 5 1400-Quad-Core processor 3.20ghz, 16gb RAM (it came with 1 8gb but i had another laying around). it only allows me to use 8gb. I've tried looking at the BIOS and updating it but theres virtually NOTHING in the bios...