Here is a quick and dirty low down.
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* The term "unlimited" denotes that the only limitions are those of PHP, MySQL, or your web server and not of the vBadvanced product.
** There is an option to allow as many upload input boxes as you wish. The actual number of files that may be uploaded at once will depend on your server configuration and the size of the file(s) being uploaded.
vBulletin 3.0.0 or higher.
PHP 4.1.2 or higher.
MySQL 3.23 or higher is recommended.
GD library (2.0+ is recommended) or ImageMagick.