and this one will tell you approx. framerates for different GPUs:http://www.notebookcheck.net/Computer-Games-on-Laptop-Graphic-Cards.13849.0.html
(note there is an option you need to select to include desktop cards also )
Thanks but I havnt actually got the PC yet. I want to see if the PC I am going to build will be good enough. For the website you mentioned you need to be on the PC you are testing