NGINX and cache ... When is it necessary?

I am using NGINX and I’ve come to understand that caching dynamic pages (.php) makes NGINX serve them much faster. However what really happens when a .php page is cached ? Is it just process of copying the HTML output of the .php file to a file on the harddrive on the server so they can be served as static HTML files ?

If this is so, then does that mean that only dynamic pages (.php) can benefit from the process of caching, while originally HTML / Static only pages will not ?

Lastly, would there really be a noticeable difference in speed between the use of FastCGI caching and the WP Super Cache plugin ? (I’ve read that it converts .php files into HTML versions) …


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Believe me when I say WPSC (using the HTML cache) is god’s work right there. You’ll notice a huge difference as you won’t even load the database anymore and the pages will renew when you update the post or if a new comment comes in (if you need it to). HTML can also be loaded in gzip form as well as WPSC generates both files per directory.