With WB Meshing: In general WB Meshing can generate 3 to 4M cells per GB while generating PC tet mesh. It can include prism generation. With Fluent Meshing: For Fluent Meshing also the rule is similar. It can generate around 3 to 4M cells per GB for tet meshing. For poly generation, it can generate approximately 2 to 3M cells per GB. With ICEMCFD: PI Method can generate around 1.5 to 2M cells per GB. All these figures depend on geometry size, geometry complexities and details included. With Fluent: Fluent take around 1.5GB per 1M tet cells for poly conversion.