Assuming you mean HP Slimline 450-a160na Desktop, and also assuming the WiFi card. It is shown on this page
https://support.hp.com/us-en/document/c04816376
Listed as a Wireless LAN 802.11b/g/n which is limited to Single band: 2.4 GHz (b/g/n).
Here is a thread with guidance from @Paul_Tikkanen for a user that has the same situation.
I'm not an HP employee.
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