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Dont get me wrong from the start, im not saying that the Killer NIC is nearly worth the money, but...
The Killer NIC has its own NPU (network processing Unit) and has RAM, and everything that a video card has. This is the future of NIC's. It is just like graphics cards. At first it was the CPU's job to handle this, but now we have $600 cards that do this job and are well worth it. Pretty soon the computer will be all "self-processing units" soon simple things like the CD drive will have its own "Drive processing Unit".
So again, for the amount of power this Killer NIC kicks out its not nearly worth it, but the idea is one of the future.