Hello,
The minimum system requirements for Zoiper 3 are:
• Processor: Pentium III 1 GHz
• Memory: 512 MB RAM for Windows® 2000 and XP, 2 GB for Vista/7
• Operating systems: Windows® 2000, XP and later; Mac OS; Linux
• Sound card: 16 bit sound card (SoundBlaster or equivalent)
• Internet connection: wired or wireless broadband