c6300 router limits speed to single pc?

[SalNunez]

I have a Netgear c6300 router when wired the speed test gives me 300+mbps. Wireless on my AC card it only goes up to 85mbps. I had a trendnet router but it kept disconnecting frequently so I had to return it but I was getting 100+mbps(I recently got an upgrade to 300mbps) so I was getting max speed on the trendnet router to my gigabyte ac wifi card(GC-WB867D-I) and with this router it doessn't go any higher than 85mbps any suggestions?

 

[SalNunez]

Also forgot to mention that My gigabyte card is latest firmware, and as for the router there doesn't seem to be any firmware since its rather new im assuming