Operating system: Windows 10 Pro
Graphics card: 4x AMD Pro Duo (Polaris)
Broken: 2.79b release, blender2.8 beta
Short description of error
Blender recognizes twice as many GPU's as are in the System.
While trying to render any scene in Cycles with the GPU's, Blender keeps crashing. In the System User Preferences by Cycles Compute Device, OpenCL, there show 16 Graphicscards up. By deactivating the last 8 GPU's the System doesn't crash and renders with all GPU's.
Exact steps for others to reproduce the error
Based on the default startup blender automatically recognizes too much GPU's.