Unfortunately the difference this card will have on your system is dependant on its age. Newer systems won't get a tangible benefit from freeing up the CPU, while the differences it can make to latencies are so slight as to make it mostly irrelevant.

PCs often find themselves the playground for over-hyped tech – it's almost as if manufacturers believe gamers will buy anything if you force enough marketing down their throats. Almost. Cue the latest in a long line of interesting ideas rendered flesh in the hope of making a pretty penny: Bigfoot Networks Killer NIC.