Let me help you with this.
It is very important to say that since your computer has Hybrid Graphics (AMD and Intel®) you should use the driver provided by the Computer Manufacture. This is because that driver was designed, created and validated specifically for system so installing another driver from other manufactures may cause lose of those special features such as resolutions or power management.
If you want to install our driver the best step is to uninstall completely the AMD driver and Intel® driver first and then download the latest driver from Intel® at this link:
If during the installation of the driver you get notifications messages or errors, try the steps mentioned here:
It is extremely important to install the Intel® HD Graphics driver first and then you can install the AMD driver for your system.
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I am not an expert in this line but I was facing same problem after updating my windows to 8.1. I would like to share my experience to you. I had explored a lot about this issues that time. actually AMD provides drivers to use its graphic processor which is AMD RADEON 8670M in our case. This drivers are universal but they are not developed to be used by devices of each manufacturer efficiently. Laptop and Computer manufacturers port this drivers according to each devices. They have to port them for each model. For dell, this process is slower than other manufacturers. And this porting priority differs from model to model. If we use directly the drivers made by AMD, they will not work proper (But they will give you the maximum performance. Using ported graphics drivers provided by manufacturer will always lag in performance little bit.) The only problem you will get by using AMD provided drivers is your device will not get sleep and hibernate. You can search on google for cmd command to do this. Other than this issue I think other applications and functions should work proper.
If you want to use AMD provided drivers, first remove every component of AMD from your computer (i.e. Catalyst centre and Graphics drivers) and then download the latest drivers from AMD and use them. It will give you high performance as well as lower battery life.
And if you do not want this troubles, then wait for dell to provide drivers for your device.