The minimal phpBB server requirements are listed below:

• A webserver or web hosting account running on any major Operating System
• A SQL database system, one of:
  • MySQL (3.22 or higher)
  • PostgreSQL 7.0.3 or higher (preferably 7.1.x or 7.2.x)
  • MS SQL Server (7 or 2000) directly or via ODBC
  • MS Access (2000 or XP) via ODBC
• PHP (4.0.3 and above) with support for the database you intend to use above

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