Even though the router, access point, and adapter are marketed as capable of 270 Mbps or 300 Mbps, the wireless connection data rate displayed by the software utility or other WiFi monitor cannot connect for more than 150 Mbps.   Reason: When operating in congested regions with many wireless networks, Wi-Fi-certified N routers and access points must comply with the WiFi Alliance's "Coexistence Requirement." The Coexistence Requirement guarantees that N devices run in the 2.4 GHz frequency spectrum default to 20 MHz operations when working close to other WiFi networks.   Devices operating within the 5 GHz frequency spectrum are not susceptible to interference and are exempt from the Coexistence Requirement. Another reason you might not be obtaining the maximum download speed because you're using a wireless device that doesn't support channel bonding. Devices that do not support channel bonding, such as the iPad, Macbook, iPhone, iMac, and some Intel wireless devices, will not connect at speeds of 150 Mbps or more while connecting to the 2.4GHz band. For further information, please visit this page. Go here for detailed information.   Solution: To ensure optimal performance, we recommend that your router use the 5GHz frequency range. If you want to go a greater distance, we recommend choosing the 2.4 GHz, frequency band.