If you’re doing computers, a PhD is about as overkill as you can get, not to mention EXPENSIVE; especially at a private university. Computers is driven entirely on experience. All the degree is really useful for is getting your foot in the door. 98% of the stuff you learn in computers will be on the job. You’re not doing yourself any favors by getting a PhD.
Also, Silicon Valley is shrinking in population. People are moving out vs moving into CA at a rate of about 10:1. That’s why we’re seeing a tech boom in cities like Austin, Columbus OH, Raleigh, Salt Lake City, and Phoenix…among other places like Dallas and Houston.
Take from a tech professional. If you go to Dartmouth and get a PhD so you can get into Silicon Valley, it’ll end-up being the most expensive mistake of your life. You’re far better off graduating debt free. Feel free to get a master’s degree, but you have to be prudent about that too. Let the company you work for pay for it. Too much debt will sink your career, especially in an expensive place like CA.