Thank you about your enquiry about WiDi Support. The Processor is enable to manage WiDi.
But also I will recommend to check with your Dell Support to ensure certification of the motherboard for WiDi Ready.
Also you can visit the Intel web site http://www.intel.com/content/www/us/en/architecture-and-technology/widi-how-to-use.html, for step by step help to help you enable WiDi.
Also please ensure that your TV or receiver is WiDi ready.