I have used this site quite a few times and unfortunately I don't hold much value in it.
I have a single core laptop, 2.8GHz, on-board graphics card, 3Gb ram and the site said I couldn't run COD MW3 yet I installed it and it runs totally fine with no issues. This is also the same for quite a few other games that the site has said I can't run but they run without issue.
A good idea though, if not always 100% accurate.