I don't have much 3d experience, but have been wanting to get into openfoam or freefoam at some point myself and be able to build 3d models and perform fluid dynamic analysis on them. It is free but is for linux (which is also free).
So it may depend on what you consider "modelling", not sure that sketchup is all that demanding that an entry level nvidia card wouldn't suffice. Lots of storage and dual boot ubuntu/windows might be an option to increase the available tools, but linux has a learning curve of its own (well, as does every release of windows).
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WINDMILLS DO NOT WORK THAT WAY!!!
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