You probably mean 768 Kbps, rather than Mbps. The 1 and 3 Mbps rates sound right. In these cases, your router would be sufficient. Your local area network (LAN) is almost always much faster than your wide area network (WAN). If you have an additional computer on your local network you will reap the advantages of the 54 Mbps onnection between machines. Your connection to the WAN (the Internet in this case) will max out at the ISP's connection speed (768k, 1m, 3m, etc).