I am the one who posted the scottsdale --> LA speed. I had a 6120, and I went and bought the Cisco 3010 from the cox store this morning. It doesn't have a built in N router which suits me fine as I have the buffalo AC router/bridge combo in my home anyway. In short, yes you have to get a newer D3 modem that is capable of 8x4 bonding. Just for a real world throughput demonstration, I downloaded wow this morning in about 10 minutes.