Often you would come across new software or operating systems like Microsoft Vista that assures you that they can run on previous PC hardware despite its high requirements prior to installation. Now the question that remains is on whether you will buy the claim or not?
Apparently as a PC user, you will not know if the claim is really true or not unless you try it. While some computers can accommodate them, there are the hidden lines that include actual performance rendering that has not been stressed. For sure, having a PC that was able to accommodate a previous Windows operating system like Windows XP will have its problems with an advanced and higher grade operating system. Issues such as processes and of course computer speed are bound to be the significant factors and as a PC user, you should place this into consideration.
With that said, would you wait to upgrade a computer before installing new software or take the risk? The safer way out is to really install these operating systems on a brand new PC with latest specs. It is not bad to improvise but if you demand high quality performance, save yourself the trouble of trying to make do with an old system that is bound to give way and perform below par.
Do take note that these are part of a marketing gimmick to save the PC companies from being unable to sell their old stock of computers. As a sign of reprieve, software manufacturers put that into consideration so make sure you avoid it.