Do you do a lot of photo-releasing rendering and FEA? If not, you will be better off with a single socket system.
Core SolidWorks is mostly single threaded and will not take advantage of all those cores. SolidWorks will not take advantage of a compute cluster at all.
PV360 will use all the cores.
FEA will use some of the cores, but over about 4-6 cores there is not much of a performance increase with the SolidWorks FEA software. This may not be the case if you are using other FEA software.
A fast single socket, quad core setup with a lot of memory, SSD drives and a good video card will be a lot less expensive.
What else besides core SolidWorks would you run that might take advantage of 16 cores?