Performance issues with GTX 680??

I just finished building my new gaming rig, which consists of:
16gb RAM,
Intel i5 3570k quad core processor @ 3.40GHz
Nvidia GeForce GTX 680
...

However, with this new rig (which I thought would probably be able to pretty much destroy any game on ultra), I am having strange performance issues (aka lower than expected framerate), in World of Warcraft, DOTA2, The Witcher 2, Diablo 3, amongst other games. I have reinstalled drivers, and made sure GPU fan is high enough so it isn't overheating. Anyone please have any ideas why I could be having performance problems like this? Thanks in advance.
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More about performance issues
  1. Post complete systems specs please, especially power supply.

    I suggest you install CPU-Z, GPU-Z, and CPUID HWMonitor to check your system temps, clocks, voltages and fan speeds under load. Make sure every component reaches its rated maximum clock profile and that max temps are normal.

    Post some feedback, and then we can take it from there.
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