Only for ones who have a compatible working 3D card in their x5000 for MorphOS, a good starting point is to benchmark Quake III. Here is a thread explaining how to set it up once you have it installed:

Quake III Benchmarking

Just run it if you are able to. Nobody with an x5000 has sat down and actually ever did it, or at least even posted about it.

[ Edited by Doffo 21.08.2018 - 18:06 ]