The Adrenaline Vault have posted an article titled, Misleading System Requirements for Games, in which they look at the real requirements for running a game compared to the requirements listed on the game box:
The consequences of misleading system requirements on unsuspecting consumers are devastating. Most computer software stores don't let you return your games for a full refund, even if you have your receipt and just bought the title a few days ago. Arguing that the offering won't run on your machine due to inaccurate minimum system requirements on the box gets you nowhere; indeed, from direct observation, I can tell you the reaction is often laughter and even mockery. Humiliated and depressed, you slink out of the store with another useless CD coaster in your possession.