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1.You need to try some old drivers for this game 16.11.5, 16.9.2, 16.7.3
2.Drivers 16.12 and 17.1 are not so good for this game.
3.Try to enable/disable Vulkan API in game settings
4.Also, your power cord must be plugged in. Your power plan must be Standard or High performance
5.Read this article closely (you can choose your language on bottom side of this article)
6.You can use AMD switchable graphics monitoring to check GPU usage in your game. Radeon settings>Preferences>Additional settings
Thanks to answering me, but i did everything you said, and nothing change
1.Your power cord must be plugged in. Your power plan must be Standard or High performance.
2.Read this article closely
3.Your GPU is not so powerful. http://www.notebookcheck.com/Dota-2-Benchmarks.99462.0.html