You can try "Can you run it?".http://www.systemrequirementslab.com/cyri
They don't list every game ever made, but they do have a huge selection and is fairly accurate.
Here's an example of me failing the Crysis 3 test. http://www.systemrequirementslab.com/CYRI/Requirements/Crysis-3/11526?p=a
Seems the only thing I failed on is the ram. should still be able to run it at lowest possible settings
Though nothing beats downloading a demo of the game (if possible) and testing it out.