IMac 27" gaming on Windows 7 overheating and graphic freeze

When i play battlefield 3 in WINDOWS 7 on my brand new iMac 27" i 7, after some time the computer gets EXTREMLY hot and graphics start to freeze.
Im 100% sure its the graphic card/ processor who gets to warm. It sounds like the fans runs on full power to.  (it only happens in windows)
Anyone know if there is a solution?
Specs:
IMac 27" 3,4 Ghz Intel Core i7
16 GB 1333 MHz DDR3 RAM
1 TB HD
AMD Radeon HD 6970M 2048 MB graphics
Windows 7 (full updated)
OSX Lion (full updated)
My earlier iMac from 2010 gets so hot that the motherboard and graphic card burned off, and apple gave me a new iMac.

Off course a tower solution will be optimal for gaming...
Except from the overheating problem, my iMac (2 gb graphic ram) runs Battlefield 3 extremely perfect. Im just affraid of everytime my mac gets warm it will be a little damaged, and like my old mac suddenly die.
Everytime my mac has overheated, it feels like osx is getting a bit slower. (feels like im slowly burn up my cpu)
Now i downloaded MAC FAN to controll fan speed in windows, but i dont have much hope because the fans already sounds like they run very fast, and are very noisy after gaming a couple of hours.

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