Slow internet speed on Premier?

I'm on Premier and just upgraded to a Cisco DPC3000 DOCSIS 3.0 modem and ASUS RT-N65U router. Had a Motorola Surfboard SB5101U DOCSIS 2.0 modem and Linksys WRT54G router previously. I was hoping for a speed increase, but that didn't seem to happen!

Previously I'd get around 3MB/s download and 300KB/s upload consistently, and those are the same speeds I'm getting now with the new equipment.

Using the speedtest from Cox, it says that I get 27Mbps down 16Mbps up, and using Speedtest.net I get 27Mbps down 8Mbps up.

Premier speeds are supposed to be 50Mbps aren't they?  Is it because I need to update the firmware on my new router, or are these speeds normal?

Thanks in advance!