If you feel the drivers are in need of updating beyond what Dell offers you have to go off to forums that discuss this in depth. Here I can only share that nugget about where to get the supported drivers.
Here's my problem:
I have a AMD Radeon HD 7670M graphics card in my Dell Inspiron 15R 5520.
The graphics are switchable. Problem with switchable graphics is that suppose I go to a website which need to scan my hardware, by graphics card won't get detected. The problem is much bigger actually.
When I try to download drivers from the AMD website, the software which I have to install first in order to get my graphics card recognised (AMD Mobility Radeon Driver Verification Tool), doesn't recognise my card either. So, in the end the problem is I cannot upgrade my drivers.
And yes, I can download the drivers from the dell website, but they are not the latest. One more problem wit this is that Dell provides Intel HD Graphics 4000 (which is my integrated graphics) drivers packed with the AMD drivers. So, when I install the outdated drivers of AMD, I have to install the outdated drivers of Intel HD Graphics as well and because of this I cannot even download the latest drivers for Intel from the Intel website and install them.