Throughput Considerations
If you require less than 10 Mbps of throughput, you can get by with the minimum requirements. For higher throughput requirements we recommend following these guidelines, based on our extensive testing and deployment experience. These guidelines offer a bit of breathing room because you never want to run your hardware to its full capacity.
10-20 Mbps - No less than 266 MHz CPU
21-50 Mbps - No less than 500 MHz CPU
51-200 Mbps - No less than 1.0 GHz CPU
201-500 Mbps - server class hardware with PCI-X or PCI-e network adapters, or newer desktop hardware with PCI-e network adapters. No less than 2.0 GHz CPU.
501+ Mbps - server class hardware with PCI-X or PCI-e network adapters. No less than 3.0 GHz CPU.