TechRadar explains the components you'll need for the maximum Windows Experience Index score on Windows 7.
Windows 7 includes a realigned WEI score. Here's the processor, memory and storage you need to max out your WEI score. Let's face it, your sole worth as a human being is entirely encapsulated in a benchmark score, and by Jove you're going to let people know about it. As long as that doesn't involve more than a forum post.