If you mean the requirements for running .NET they can be found
here[
^].
If you mean for running your application then I have to say that is entirely dependent on your application. If you do a lot of graphic processing you will need a good graphics card. If you need to fetch lots of data from a server or the internet you need a fast internet or server connection. You get my point :)
To get to know how well your applications runs on different systems simply try running it on different systems.