Inspiron 15 5000 - half internet speed

I purchased two of the Inspiron 15 5000 gaming laptops. We set them up - minimal changes. Added users and installed some games. We are getting anywhere from 1mbps to 50 mbps but we pay for 120mbps. We have four computers in the same room. The laptops are the closest to the wireless router. The other two computers are older imacs. They are getting between 90 and 120 mbps. They are 5 - 10 feet further from the router. We have contacted support and they updated drivers. No change. He updated the settings on the network card and still no change. I can't believe that two laptops would have the same problem. We turned off all of the other wireless devices to see if they were the problem and achieved the same speed. Is this really a limitation on the gaming devices that they cap out?

Any other experience on this?

Tks.

G.