@ouyahama

If you're planning to go with the EVGA 670

A. You need better cooling and dare I say, better cable management in your case.

B. You need a bit of software like evga precision x and you need to manually raise your fan speed or setup a fan profile.

I suppose you have not googled for issues in the EVGA 670.

Let me google it for you :

http://lmgtfy.com/?q=EVGA+GTX+670+overheating+issues