Dell's Inspiron 15 5515 is an office notebook that comes in a simple and sleek design, accompanied by up to 4.3 GHz of fast AMD Ryzen 7 power and a rather large battery. In this review, we put the laptop through its paces. https://www.notebookcheck.net/Dell-Inspiron-15-5515-laptop-review-Enduring-office-notebook-with-untapped-potential.637259.0.html
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It seems tests were not performed in dual channel mode
Impossible for a laptop to have such low performance in comparison with others(of absolutely same hardware)