qualcomm atheros ar9485 wireless network adapter speeds

I also swapped the black and white wires on the card and it still shows up as 72.2. Even swapped out the card with another Atheros card. I've updated the drivers, deleted the drivers, reinstalled the drivers. I restored to factory default of Windows 8. THINGS I'VE TRIED: I'm running Windows 10. One TP-Link card, rated at 300 Mbps, shows 292 Mbps. Two Atheros cards, both rated at 300 Mbps, both show 72.2 Mbps. The Atheros has a download speed of about 1 Mbps and the TP-Link was around 17 Mbps. Speed testing both confirms that I am losing Mbps.

QUESTION: So why am I losing Mbps on the Atheros but not the TP-Link? They are both rated at 300 Mbps but the atheros only shows up as 72.2 Mbps. Its rated at 300 Mbps and it shows up in the wireless status as 292 Mbps. So I bought a new TP-Link USB wireless adapter.

As luck would have it, I had a spare atheros card and popped that in. But in the wireless status it only shows 72.2 Mbps. The atheros wireless network card that came with it is rated at 300 Mbps. PROBLEM: I bought a new ASUS laptop model X551MA. Sorry if this has been asked and answered but I could not find anything that fit my problem.

Qualcomm atheros ar9485 wireless network adapter speeds