[Macbook5,2] GPU runs too hot when running any 3D accelerated games and shuts down.

So I recently got into running Windows on my late 2009 Macbook with the integrated Nvidia GeForce 9400M chipset.
Now, I know it has been pointed out this is not an amazing piece of graphical hardware, and that is of course understandable.
I do not see however, why when my fans run at max (6200 rpm) it can not deal with me running some games. (Whether or not I decrease the quality of the graphics seems to have no bearing on all of this.)
Interestingly enough I can run a stress test on both cores and the CPU cores only gets up to 89C and maintains that or drops down to 88C at full fan usage.
The GPU makes the computer instantly shutdown (or when I am lucky suspend, so I can wait, come back, and save) around 90C.
What is also interesting is that when I used WinE based technology on Mac OS this did not happen. My guess is this is because Mac OS does not let programs access the hardware directly (or so I have heard).
My question is basically this: Can I keep this from happening, and if so, how?
I've read articles about underclocking the CPU, but I assume that reducing the heat from the cpu would not greatly (if at all) affect the temperature of the GPU. Can I underclock the GPU?

Oh yes, just to be clear, the reason I do not "just use the WinE based technologies" is that with the added compatibility layer the games run extremely sluggish.

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