VISTA requires more RAM rather than proccesor

vista is huge thats why it requires near 512 mb minimum ram and 1.8 ghz proccesor ,its not compatable with most of software we are using these days , so we have to wait some time to establish vista , its cool looking and more user friendly , it works more smoothly as compare to older versions like xp its more stable and lesser virus risks , there are much more feature in vista as compare to xp or 98