Using FastCGI with Dreamhost PHP

I don’t know much about FastCGI, but it sounds like PHP can automatically take advantage of it if configured with “–enable-fastcgi.” Is that accurate?

Since I’m using Dreamhost’s PHP binary which was configured that way, if I turn on FastCGI for my domain will my PHP scripts automatically use it? Or do I need to specifically design them to use FastCGI features?