You don't need fraps to verify your FPS. All the games listed have tools and keyboard commands inside the games to see your FPS.
As a good tool you can use this: http://www.systemrequirementslab.com/cyri
This will pull all your system information and compare it to the Minimum, Recommended and Max settings for games and will gauge where your computer stands.
As for just looking at your specs, I believe in order to achieve upwards of 40+ FPS you will need to run low to medium settings. But don't take my guesstimate, look it up on the link I gave you.
Hope this helps you.