Here is Dell latest Firepro Laptop driver for your GPU Card: Support for Precision M4800 | Drivers & Downloads | Dell US
It should correctly identify your GPU card. Sometimes Drivers (Normally Generic Laptop drivers) may not correctly identify the correct GPU card installed but it still is compatible.
Also go to Dell Download page for your Laptop and update all of your Intel drivers especially the Intel Graphics and CHIP set drivers from here: Support for Precision M4800 | Drivers & Downloads | Dell US
The Intel drivers should be first updated before updating the AMD Graphics driver.
Plus you have an Urgent BIOS update from 2018, same download page.
NOTE: Use GPU-Z and see what it says you have installed on your laptop.