lol who cares how much ram it uses? Its a newer OS, newer OS = more ram usage. I would be worried if it didn't use more ram for things. On top of that RAM is so cheap its not even an excuse anymore not to buy 16 gb of ram for 50$
Win8 actually uses less ram than XP, but it makes better use of the ram for caching. It will immediately free the cached data at the slightest hint of memory pressure.