I have bought a Dell Inspiron 3537 with AMD Radeon 8850.
I have installed drivers for Intel HD graphics card and AMD CCC for the 8850, and both the cards are visible from device manager and everything seems to be ok.
However, in Switchable Graphics Application Settings, most of the applications are locked and I cannot change the plan to "High Performance". Moreover, when I change for example my browser in High Performance mode, I then open Switchable Graphics Application Monitor and I realize that it continues running in "Power Saving" mode. So, it seems that there is no way I can use my 8850 graphics card.
I am using Windows 8.1 x64 and I cannot find driver for 8850 in Dell Support page. So, I installed the AMD driver using the Catalyst Driver Manager.
p.s. Both Intel and AMD video cards have been checked for updates from Windows device Manager. BIOS and other drivers all updated too.