In this quick post to the ApacheLounge forum, Steffen shares some stats running PHP in two different methods of running PHP on Apache - mod_php and fastcgi.
With PHP as module after some time the memory usage of Apache is growing and growing up to ~800M.
With mod_fcgid is stays on a steady ~100M
PHP configuration: only with the extension php_mysql.dll and eaccelerator.dll
A graph of the statistics is also provided.