Download this program, install it, and run it. You will know about the components installed on your system. You can post the results here, by going into File Menu of the program and click on Save as Text file, save the file on desktop, and post it here.
http://www.filehippo.com/download_speccy/
About PSU : See the sticker on the PSU, it will have the info, like Name, Watt, etc.