Since you have Linksys EA6500, try enabling the 5 GHz band simultaneously with 2.4 GHz band. Keep the 2.4 GHz band in mixed mode while set the 5 GHz band to use AC mode (i.e. it can also be called 80 MHz channel width in the router). Also give a different SSID to the 5 GHz band. Let your Dell connect to the 5 GHz band and you should see speeds greater than 300 Mbps.
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