The system requirements for vBulletin 4 are higher than vBulletin 3 and are as follows:
- Minimum:
- PHP: 5.2.0
- MySQL: 4.1.0
- Recommended
- PHP: 5.2.6 - 5.3.x (5.4 only supported with vBulletin 4.2.2)
- MySQL: 5.0.19 or newer
- Third-Party
- cURL