A website that compares your computer specs to a games requirements?

I used to use a website that checks your computer specs and compares it to a game that wish to play on it and it tells you if your pc will run it and what to upgrade it does anyone know the name of the website it's very useful when buying a new game to see if it will run smoothly or at all on your machine.

Any help would be appreciated thanks

System Requirements Lab

Edit: Linkified

I just remembered the website it's called www.systemrequirementslab.com for anyone unsure if a game will run on your rig you should check it out it's not completely accurate but it gives you a rough idea

I use canyourunit

Yougamers is the best out their IMO.

Yougamers is the best out their IMO.

JangoWuzHere