Question aus tuf fx 505 (problem at upgrading ram)

Sep 21, 2019
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my lp is already 4g ram. so i want to upgrade my ram. i bought ram 8gb 2666mhz , then i upgraded it by myself. after placing ram into another slot (which is next to current ram), it still 4gb after i start my lp. what is my problem?? ..thank you... btw i bought brand kingston