Dell optiplex 390 SFF wifi driver

If your pc came with optional factory installed Dell Wireless 1520 PCIe WLAN card (802.11n), as mentioned in 390 technical guide, which is a low profile card for 390 SFF, you would need to download driver from Dell support. https://www.dell.com/support/home/en-us/drivers/driversdetails?driverid=0h2hw&oscode=w764&productcode=optiplex-390 If you had a third party wireless card you would search for the appropriate driver.