So we have 2 different laptops. Mine is a year old and hers is 4 years old. we both ran a speed test about 8 feet from the router/modem. Our upload was the same 12mbps. But my download speed was 60 mbps and hers was only 20 mbps. I run Windows 8.1 on mine and she is running windows 7. Why is our download speeds not more similar?