Follow the recommendation for the game you will play for minimum system requirements. The reason to follow the system requirements of a specific game is because the performance of the CPU, GPU and PPU hardware depends on how the game software is written.
In general, by testing many games we have the following guidelines may be useful.
Recommended Minimum System Requirements:
- Intel Pentium 4, Intel Celeron or Higher
- AMD Athlon 64 , AMD Sempron or AMD Athlon XP or Higher
- Microsoft Windows XP/Pro/Home/MME 32bit , With SP1 or later upgrade
- System Memory 256MB or higher
- Free Hard Disk space of 50MB or greater
- PCI Slot revision 2.2 or later, 3.3V
- AGP or PCIe Graphics card Supporting DirectX 9.0 Shader Model 2.0 or higher