I notice in recent time some web page is not cached by google although they have a healthy PR ,any one can know how Google provide PR when the page is not cached by Google.:)
Wizard
7:23 am on Aug 3, 2005 (gmt 0)
PR has nothing to do with page cache. It is calculated on the basis of not on-page factors - the inbound links from other pages.
Even pages removed from the index with URL Console have their PR, however not shown in the toolbar.