What hardware do I need for organization of 8 seats?

We tested the program Friendly Seats in the mode of 8 seats on a computer that has this configuration:

• CPU: AMD Phenom II X3 720
• Motherboard: MSI 790FX-GD70 (socket AM3)
• Memory: DDR3 1333 4 GB
• Graphics cards: NVidia GeForce 9400GT 512MB (4 pcs.)
• HDD: Western Digital WD5001AALS-00L3B2 (500 GB)
• Power supply: 750 W

In addition, we bought: USB-PS/2 adapters, VGA cables with 3 m length, active USB-hubs with 7 ports each and USB-cables.