Strengths of the Extensa 15 include the Core i5 processor, NVMe SSD, low noise levels and moderate heat development. The installed display represents the biggest weakness of the system. The preinstalled Windows 10 Pro OS is partially responsible for the price.
https://www.notebookcheck.net/Only-single-channel-RAM-review-of-the-Acer-Extensa-15-EX215-51.453819.0.html
single channel and a free slot=not for use or testing but for second module and money savings.
for gods sake, stop testing single channel if there are plenty of dual for the SAME laptop model.
tell this to buyers and readers.