|I don't understand the setup you are describing. To have used your wireless connection you must already have had a modem or modem/router. So where have you connected this new modem? Perhaps you could describe the exact setup, listing all of your network equipment from the wall plug to the computer. Also tell us what sort of connection you have to your ISP.|
Apart from all that, the answer is that you should notice no speed difference between a wireless connection and a wired connection. Your link to the Internet is almost certainly slower than either of these, and this is what determines your total connection speed.