Game requirment sites

We would like to share game requirements  sites .It help us to choose right game before downloading.We must check it before downloading .Some games are not work in all pc and there is also need graphics card for run game.So we provide game requirements to solve this problem.
http://gamesystemrequirements.com/ ,http://www.game-debate.com/ ,http://www.game-requirements.com/ etc. Those sites are helpful to us .