The article clearly states that this is a myth unless you are running Qos sensitive apps
"I had my LAN admin measure bandwidth between my port and the port my test machine was connected to by monitoring bandwidth usage at the Cisco switch that connects us. He says it's even QoS compliant. Guess what? NO DIFFERENCE. Please let your readers know! XP and Microsoft get enough bad press as it is, some of it (admittedly) well deserved. "