I doubt it is a graphics issue. That game ran perfectly on my GTX 260. It could be one of many problems. Disable all overclocks before troubleshooting if applicable. Check the drivers on your memory controller and make sure you're using the intel drivers (I'm assuming you're running an Intel chipset). Ensure your drive is operating in RAID or AHCI mode and that the appropriate Intel Rapid Storage drivers are installed (there are separate ones for RAID and AHCI). Make sure your main drive is indeed plugged into an Intel port on your motherboard and not one of those Marvell or other crappy controllers. Disable page file as others have mentioned. Burn Memtest to a CD and boot to Memtest and let it run a couple times (this is unlikely to turn anything up IMO). Double check your RAM settings and make sure they are correct and that the correct latencies are being used. Follow an SSD optimization guide if you have one.
Update to the latest nvidia drivers and install Nvidia geforce experience to ensure that the graphics drivers stay up to date. Reset all of the settings in Nvidia's control panel to default. Launch the game, run at the correct setting (low, medium, high) for your hardware, and disable antialiasing and enable vertical sync.
Double check the audio drivers. If you are using the onboard sound with the universal drivers, try using the motherboard-specific drivers, or vice versa. Set your bitrate and sampling rate to 16-bit 48 kHz in Windows or 16-bit 44.1 kHz.
If you feel like you're at your wit's end, it seems like your hardware is squared, and it's still stuttering, it is definitely possible that it is the network connection. Try jacking directly in instead of using wireless or vice versa. Run line quality tests on different websites to test the connection. Some MMO's will literally stutter like your computer is bogged down when all it is is the internet.
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