I recently purchased the TP-Link TL-WDN4800 PCIe wireless adapter only to discover it was delivering speeds well below what my network is capable of. I own a Macbook Pro which reports around 90-100Mbps on my 5Ghz downloads, meanwhile this adapter is only allowing for 10-25Mbps on my 2.4Ghz connection, and less than 5Mbps on my 5.0Ghz. Both my Macbook and my desktop are located in the same room.

As far as I know, I have the most recent drivers:
Provider: Qualcomm Atheros Communications Inc.
Date: 11/10/2015

Would this be a result of drivers or some potential incompatibility? If not, what other problems might be present?

Thank you!