I would try Dell directly, some OEM's have specific drivers for their products. Not sure if AMD's drivers that you link are compatible with that system.
Here is a link to Dell's support page for the drivers for that system. The driver for that graphics chip are at the bottom of the page (after hitting load more several times)
Mainstream (i.e. Crimson) drivers will not always work with OEM laptops.
Visit the link below for the specific driver for your laptop GPU, provided by Dell directly - if that still throws issues, just let us know
maybe you need the Legacy-Driver - but usually you should try the OEM provided driver first