I assume that your network speeds are Mbps, (bits per second), not MBps (bytes per second).
Your laptop supports 802.11b/g/n according to the
model specs.
802.11n supports up to 600Mbps (in theory), but obviously requires an 802.11n access point.
The
Samsung NP530U3B supports 802.11 a/b/g/n
If the Samsung NP530U3B is getting 80Mbps, then it must be running better than 802.11g, therefore you must have a 802.11n access point.
It looks to me that your NP-RF711 is connecting at 802.11g speed (< 54Mbps) and that a configuration setting needs to be adjusted on the NP-RF711 to use 802.11n rather than g.
If this is the case, it would be under the wifi NIC properties in the network & sharing centre.
SD