NO ... But if you're having Marvel LAN problems; I suggest you uninstall or rollback the Driver and if you have the CD-rom that came with the mobo; use the Marvel LAN driver on the Cd-Rom. Don't use the Drivers that come on Windows Update; you WILL have problems. Intermittant restarts, BSOD's etc.
If you wish to disable it completely; Disable the driver.
Edit: Control Panel>System>Hardware>Device Manager>Network Adapters: right clik on Marvel Yukon gets a menu for Disable or Uninstall driver or Update Driver