Displacement for Iray needs more Geometry than say 3delight. In the Iray Displacement settings is a Sub-D (subdividing) value. If the mesh as a good number of polygons already then a value of 3 or 4 might work, IF not it may need to go higher. But it will drain the resources in doing so, so something to be weary of.Learn everything an expat should know about managing finances in Germany, including bank accounts, paying taxes, getting insurance and investing.
IF you are trying to make art I would stick with blender and work in it and use it with the Linux operating system of your choise. Blender runs 2X faster in Linux than Windows 10 which is both a vram and regular ram hog, not to mention running a bunch of useless crapware in the background stealing cpu horsepower and sending telemetry back to MS ...
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