OPNsense 19" Quad Core rack mountable appliance
all OPNsense appliances come with the e-book:
'pfSense The Definitive Guide' for FREE!

The OPNsense Quad Core rack edition is an out-off-the-box firewall experience, with the pfSense open source firewall software in an embedded, quiet appliance that consumes ~100Watt, with all the features you might expect from commercial firewall solutions for a fraction of the cost.

This appliance is probably the fastest pfSense appliance ever!

2.67Ghz Intel Quad Core Q9400 CPU and Intel 82574L PCI Express Gigabit LAN controller for ultimate performance.