How much RAM do I really need for gaming? - PC Review
 

"For this test I thought it would be interesting to find out exactly what the performance implications of using different amounts of RAM would be in various gaming scenarios. I have been wondering if 4GB is enough for games nowadays, as it used to be the 'sweet spot' around 3 years ago. However, many systems are now using at least 8GB, due to RAM being one of the lowest cost components in a modern PC. What I want to know is –'Is 8GB of RAM really necessary for current gaming?'"

http://www.pcreview.co.uk/articles/H...ed_for_gaming/