Hi, my G751JY laptop lacks 5GHz functionality. What is currently the fastest Wi-Fi 802.11AC capable adapter that money can buy for my laptop?

Trying to figure out here what may the cause be.. and maybe avoid somehow those bugs.So if you have ever faced problems (cold/black/hanged etc..) with shutdown, boot or reboot please provide here with some infos.Are these happening mostly after windo...

From what i noticed the hard way (yesterday i got a G751JY), even though this laptop is a beast.. there are some damn serious matters (both hardware & software wise).Problems:SOUNDWell sound is pretty terrible. *I am a technisian in a computer servic...