How much FPS?

On monday im getting my new computer, how much FPS you think im going to get?

Intel® CoreTM i7 920
6G DDR3
1 TB
Nvidia 9800 GT 512MB
• Multimedia BluRay / DVD-RW
• WIFI
• Drive Card Reader
• Optic Mouse
• Keyboard USB
• Tv tuner

And which video card you think its better becuse i already have one:
Nvidia 9800 GT 512MB
Nvidia 9500 GT 1GB

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