Why does my iMac temperature go up when running games through Windows using BootCamp?

Hey guys,
These are my current specs: iMac 27 inch, intel i7 quad core 3.5 ghz, 16gb ram and 1tb sata hardrive with nvidia gtx 780m.
Ive installed windows on my mac and have discovered that when running games the temperature is much higher. For the same game on Windows i've had my CPU run at 80-81 C on roughly all cores and my GPU temp went up to 85 C. On mavericks same game runs at temps of 58 C for CPU and 71 C for GPU. However on mavericks the frames rates are lower even when running same settings as on windows.
I tend to think that mavericks is somehow limiting my hardware in order to keep the temperature down whereas on windows on my mac I can really feel the kick of the system yet the temperature goes really high. Is there any way to sort this out?

gpu driver optimising is much more used in windows it give better fps but less stability and as you notice more heat and more noise as the fans work harder
lower the eye candy and resolution is a cure

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