True, but you'll find very few software can actually run in parallel (with themselves that is). One which is "embarrassingly parallel" is rendering - i.e. once you've modeled the 3d shape then added all the materials, lights & effects (which is 99% of the actual work), you send it through the rendering process which can use multiple cores (and some of them can even use multiple PCs at once).
Generally for something like 3d modeling (3dStudio, Revit, AutoCAD, SketchUp, Blender are some of what I've used before) the modeling process itself (i.e. that where you actually spend more than 90% of your own time) has no parallelism whatsoever. So for this portion of the actual work, a faster CPU for a single thread is better than a bunch of slower cores. Some of these have attempted to do stuff like real-time display using multiple cores or even the massively multiple cores of the GPU, but they still have very little success in the actual use of the program (i.e. the functions for modifying and creating models).
Though I'd advise something with at a bare minimum 2 cores, preferably 4. Seeing as you tend to make use of more than one program at a time. Thus while one of them has that hour-glass / circle going you can continue with the other.
In general (for Revit) I try to get something with at least 3GHz and around 4 cores. Some mobile chips have a "turbo" feature which "steps up" the Hz from somewhere in the 2GHz to just over 3GHz - so usually that's reasonable (just remember to keep your hands away from the vents else they'll blister).
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