Hi:
How many antenna cables are connected to the wifi card in there now?
There is probably only one.
All but one dual band AC cards that I know of, require two antennas be present and connected to the wifi card.
If there is only one, then you can use this 1 x 1 AC card which has a maximum throughput of 433 MBPS when connected with an excellent signal on the 5.0 GHz wifi band.
The card has been on back order at HP for ages now, but you can get one on eBay.
Do your search by the HP part number, not the model of the wifi card.
Realtek RTL8821CE 802.11 ac 1x1 WiFi + Bluetooth 4.2 Combo Adapter (MU-MIMO supported) HP Part # L17365-005
If by chance your PC does have two antenna cables present, let me know, and I will give you a better alternative.