Graphics card is massively overheating

So lately when I play games, I play for like 30minutes and my computer shuts off. I downloaded speedfan, and it says my graphics card is at 70 C at idle. Then when I play a game speedfan says it's at 105 C. The fan on the graphics card is still running and seems to be fine. Also if anyone has speedfan the temp3 is at like 60 C idle and 80+ C ingame, anyone know what temp3 is?

What could be causing my graphics card and whatever temp3 is to be massively overheating, and how can i fix this?

NVIDIA GeForce 9600 GT
AMD Athlon(tm) 64 X2 Dual Core Processor 5200
CPU Speed 2.72
4gigs of RAM
500 watt power-supply
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More about graphics card massively overheating
  1. How you can fix it depends on what kind of system you run. Please provide some details regarding your specs.
    These temps are way too high .
  2. added specs.
  3. If it is the single slot reference design then just clean it and its not brain surgery or building a hydrogen bomb from toothpicks and paper clips.
  4. Prolly a hairball in the radiator/vent. Take the time to remove the card, give it the mother of all cleanups, make sure the heatsink is properly seated, and re-insert it.
    See how that goes for the temps.
    And while you're at it, you might wanna do the same for the CPU and the rest of the fans. A good clean-up goes a long way.
  5. My computer is really really dusty, would that possibly be causing the problem?
  6. Yes.
  7. Yes, take it outside and do a thorough job .
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