What is the Make & Model of your MOTHERBOARD and PSU?
Processor Intel(R) Core(TM) i5-4670 CPU @ 3.40GHz, 3401 Mhz, 4 Core(s), 4 Logical Processor(s)
and mother board is System Model H87M-HD3
Is your PSU greater than 500 watts? You didn't mention the PSU you have installed.
This is the latest AMD Graphics Drivers for your R9-270X for Desktop and Windows 10 x64 : Desktop .
Do you have the latest DOTA2 Updates and this huge Patch installed:
Dota 2 patch 7.08 also brings Spring Cleaning 2018
Disable "Fast Start" from BIOS if you have it active and in Windows Power Options. Also set in Power Options "High Performance".
Found this older thread from AMD Forum about the Radeon Wattman crashes you are having. Read through it and click on all the links from kingfish comments to help you set up Wattman properly so it won't crash.Default Radeon WattMan settings have been restored due to unexpected system