Bigfoot Networks Killer NIC network card Review
 

After spending several weeks playing games on the Killer NIC one thing is clear to me: it actually does work. However, the degree to which you'll actually feel the difference depends very much on the game and your own sensitivity to lag-induced artifacts. The Killer NIC doesn't completely eliminate lag, either; it can't do anything to combat lag caused by overloaded servers or congested networks. Overall then, the Killer NIC's impact on lag varies from noticeable to subtle. I didn't find it to be striking or obvious. That makes it difficult to swallow the $250 price tag associated with the card, especially since the alternatives you get for ''free'' on your motherboard perform reasonably well.

http://techreport.com/reviews/2007q3...c/index.x?pg=1