I HAVE i5 3450 and r7 265
everytime i open matrial preview or render preview
i can't see anything but grey things or black
and then blender crashs
using prorender engine
but cycles works fine
i just want to use my gpu to render as it's faster
Could you provide Blender log? It should be located in C:\Users\user_name\AppData\Roaming\Blender Foundation\Blender\2.82\scripts\addons\rprblender.
Also, what OS are you currently using?