Minimun requirements for WidevieW

Hi all,I have now a little room just for my sim but I can't install a projector because it is too small. So I'm looking into a WidevieW solution with at least 3 or 5 PCs.I was wondering what is the minimum requirements to run WidevieW without decreasing FS performances.I use a AMD Athlon 2800+ for the main FS.There's a lot of cheap used PCs available, of course I don't want to spend on high speed PCs if it is not required.Also is there a way to use more than one monitor on a PC with WidevieW.Thanks