There seems to be a lot of confusion about these two technologies, so i figured i write the differences between the two. WiDi is Intel`s solution to transfer data from the laptop to a TV. With this technology you use the IGP of either i3, i5 or i7 CPUs (those with an IGP) to display things on the TV. And to actually transfer the data from your laptop to the reciever, you will need a Wireless card. Wireless-N 1000, Intel Advanced 6200/6230, Intel Ultimate-N 6300 is cards that is able to transfer the data. You will also need a software which i don`t know the name of to run it all from your laptop. And at last you will need a reciever by the TV. The only manufaturer i know of that makes these are Netgear. You have two different types. 1: Push2TV which can recieve and output up to 720p. 2. Push2TV HD which can recieve and output up to 1080p. i3, i5 and i7 1st gen can only manage to get up to 720p on the TV. i3, i5 and i7 2nd gen up to 1080p. According to Intel all laptops that are compatible with this technology have this marked on them And here is a list of laptops that is compatible. ptv_supportedlaptops_usa No alienware is on this list for some reason. Probably because they are not bundled with the software. M17x R3 have all the requirements filled. NB: You cannot use the M17X R3 versions with 120 Hz (3D) screen with WiDi because the IGP is disabled and WiDi relays on the IGP to display things on the TV. WiDi 1.0 supported streaming up to 720p and you had to watch the same on the laptop screen as you did with the TV. No multitasking available. WiDi 2.0 supports up to 1080p and you can stream video/music etc to the TV while at the same time do whatever you want with the laptop. WiHD on the other hand is also a technology to stream data from the laptop to your TV. It is made by a whole bunch of electronic companies, and it is a direct competitor to Intel`s solution, which is? Yes WiDi (Do not forget this now). WiHD is also available for Bluray players, Cameras, audio equipment to stream data to TVs wireless, not just from laptops to TV. Ok that said, the requirements for this technology is: You need a transmitter AND a reciever. According to the manual and the part list, M17x R3 will later have the option to add-on a SiBEAM WiHD card which acts as the transmitter. It is not included today. Here is a video of a guy testing it out YouTube - Alienware M17x WiHD Demonstration Anyhow, you can buy WiHD kits to be able to stream data from the laptop to the TV for those who do not have add-ons like the WiHD card. Here there are several options available. From big boxes to small USB plugs. Here is a few kit examples: IOGEAR Wireless HD Kit GWAV8141K Review IOGEAR - GUWAVKIT2 - Wireless HD Computer to TV Kit The first one supports video streaming up to 1080p while the last one only up to 720p. Some new HDTVs today have an integrated reciever so you won`t need a reciever, only a transmitter. Probably the benefit of having many big electronic companies working together to incorporate this technology. With WIHD you can also do other stuff with your laptop while streaming data to the TV. The difference between WiDi and WiHD is that WiDi use the Intel wireless cards to transmit the data from the laptop to the TV, while WIHD use a transmitter to transfer the data.