I installed the latest drivers. I had before Catalyst and all be ok.
On new drivers I can not set resolution 1680x1050. The option does not work - additional card settings.
What to do?
I am afraid you do not have latest driver installed (R9-2xx models are fully supported). Unless you are using Windows Vista (or even XP), you should install Crimson 17.x drivers available here - please choose according you Windows version and bitness:
Radeon™ R9 200, R7 200, R5 300, R5 240, HD 8500 - HD 8900, and HD 7700 – HD 7900 Series
I recommend to go through clean-install way in the Crimson installer, or even uninstall old AMD drivers first.
Maybe new drivers do not support your video card. What is your HW configuration? What is the version of the driver package?
Now my drivers - 16.11.5. My video card - Radeon R9 280X
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