The minimal Drupal server requirements are listed below:

• PHP 4.7 or above - http://php.net
• MySQL 4.1 or above - http://mysql.org
• Apache 1.3 or Apache 2.x - http://apache.org

You can find more comprehensive information about this in the official Drupal documentation at:

http://drupal.org/requirements

SiteGround servers are fully optimized to meet all Drupal requirements and to provide the best web hosting environment for it.