Hi. I'm stupid.
What would something like this be used for?
Anything you want.
The less smart ass version of an answer is that CPU's like this can be used for content creation applications, database work, 3D modeling / rendering, video editing and encoding, virtualization, and a ton of other things. Heavily threaded applications are used in various forms of scientific / medical research. The best part is you can do any combination of things at the same time.