I have a lenovo g505s which has windows 8.1 and another g450 which has windows 7 ultimate. When i run speedtest .net on both of them, i get just 1-3 Mbps on g505s and 8 Mbps on g450. I have opted for the 8 Mbps plan. Every device in my house shows 8 Mbps except the g505s. Is there a problem with the OS? Cuz even if connected to router via LAN shows 3Mbps. I am thinking of downgrading it to Windows 7 but there are no USB 3.0 drivers available. What do i do?