[all variants] Application Preload and Games?

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http://ubuntuforums.org – I see a few blog's and video's talking about an app called Preload. (Program that cashes common run programs in RAM) I have seen people say it works excellent for machines above 6GB Memory. I do have 8, but I am wondering if this will rob preformance from games. I do plan to take advantage of Steam showing some love. It says it does use up to 50%, so will it clear it out of the way during games or am I stuck with 4GB to run the OS along with the game when playing? (If I were to install it) (Hardware)