OK, this is not an easy thing to get a handle on (but works well once you do). Firstly, forget WiDi as this is something else (long history, just forget it). This system in AU is Miracast, even though it can use the network (through the router) to talk rather than via a direct wifi link to the device concerned (as you may be more used to with Miracast). This has the advantage of being able to access the internet and other network resources whilst also projecting your display unlike a direct connection (but also adds potential competition for bandwidth, so watch out). But it very much is still Miracast. Try it with your phone or tablet or laptop which supports Miracast, now you don't have to disconnect from your LAN and connect directly to the client device. W10 PCs now make the BEST Miracast destinations by far just because of this. No need to use my Roku stick for this ever again.
Miracast does not care what CPU you have (this rumour comes from old proprietary Intel WiDi stuff, which I told you to forget about, and is very ancient and irrelevant info). It only cares that you have a vid card that can support Miracast (so all modern Intel, AMD and Nvidia cards will do this) and that your network card can support Miracast.
And that's where the problem lies. The network card needs to support the NDIS 6.4 standard. Wireless cards are more likely to support this as Miracast tends to be used with them (or has been in the past), but even then add-on USB wifi sticks tend not to support this. Some probably do, some store bought internal cards probably do, but good luck in finding those specs on the web or anywhere. Ask the shop assistant and their face will be a picture. The good news is that most modern laptop, phone or tablet built-in wifi cards will support Miracast. Perhaps you can 'reclaim' an old PCI-E card from an old (but not too old, must support Miracast of course...) laptop?
If anyone knows of a PCI-E WIRED Ethernet card that can support NDIS 6.4 and so works with Miracast, I would be interested too. Heck, I might even grab a USB wireless stick that supports such. No-one will know which works without home testing though, so the only way we can build up an understanding here is if there is a concerted effort in the community to test the hardware we have.
To kick the ball off, the Realtek gigabit LAN chipset in the AMD Sabertooth 990FX motherboard does not support this. How about you? Especially if you have a separate card/stick that works rather than a built-in network connection.
Another approach is to say that Miracast is least useful on a desktop, so why bother. If you have a Pro edition of Windows this makes a lot of sense. Using the Microsoft Remote Desktop store app you can easily 'project' from your desktop PC to any other, except you'll have full control through the client device. It's just better for such purposes, and there's no need for Miracast support in your network card for this. Not so good for throwing your tablet or phone screen onto the TV (though those devices probably have Miracast) but for a desktop PC it is usually the better approach (so long as you have Pro on the desktop, that is the big restriction, but there are 3rd party remote desktop systems for non-pro desktops which I haven't tested).
Oh, and forget USB. There is (was?) a separate Windows Phone system whereby you could run a MS provided utility and plug your phone into your PC with a USB cable to show the display. It would only work in a small vertical image of the display I seem to remember. Tried it once... pointless. That has been superseded.
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