If you're playing Dolphin, avoid anything from AMD from the Radeon HD 6000 series or older (HD 5000, 4000, etc). They're pretty terrible with the OpenGL renderer and don't support the Vulkan or DirectX 12 renderers, limiting your options to DirectX 11 which isn't always the best for emulation. You want Radeon HD 7000 series (7750 and above), or Radeon 200, 300, or 400 series.