Your gaming woes might be linked to overheating VRAM, not the GPU core ...
Before you replace your graphics card, try these fixes: clean cooling, better airflow, fresh thermal paste, and a smarter fan ...
This post helps to fix Radeon Host Service High GPU, CPU, Memory, and Disk Usage problem on a Windows computer. Some users have complained that when the Radeon Settings: Host Service (AMDRSServ.exe), ...