@DyymDad
Welcome to HP Forums,
This is a great place to get support, find answers and tips,
Thank you for posting your query, I'll be more than glad to help you out 🙂
I see you need help in upgrading the WiFi adapter and GPU, on HP Pavilion 590-p0050 Desktop. Don't worry as I have a few suggestions which should help you.
After reading your post, I did go through the Product specifications of your product and found that you have Wireless LAN 802.11a/b/g/n/ac (1x1) and Bluetooth 4.2 M.2 installed on the PC.
To get the answer to this question, Yes! it's compatible with 802.11ac and Here are some tips for finding the best video card for gaming. Click Here
Hope this helps! Keep me posted for further assistance.
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ECHO_LAKE
I am an HP Employee