Please post screenshots of your HWinfo sensor readings while a game is running. Since your system crashes when you run games, make sure your HWinfo window is already open before you open the game, so you can take screenshots of the HWinfo sensors before it crashes. Taking screenshots at both idle and under a gaming load would be even more helpful.
How to post images of hardware or test results in order to help with troubleshooting.
In order to help you, it's often necessary to SEE what's going on, in the event one of us can pick something out that seems out of place, or other indicators that just can't be communicated via a text only post. In these cases, posting an image of the HWinfo sensors or something else can be extremely helpful. Here's how:
*Click here for instructions on how to post images in Tom's hardware forums
Run HWinfo and look at system voltages and other sensor readings.
Monitoring temperatures, core speeds, voltages, clock ratios and other reported sensor data can often help to pick out an issue right off the bat. HWinfo is a good way to get that data and in my experience tends to be more accurate than some of the other utilities available. CPU-Z, GPU-Z and Core Temp all have their uses but HWinfo tends to have it all laid out in a more convenient fashion so you can usually see what one sensor is reporting while looking at another instead of having to flip through various tabs that have specific groupings.
After installation, run the utility and when asked, choose "sensors only". The other window options have some use but in most cases everything you need will be located in the sensors window. It usually takes three screenshots to capture all the reported sensor readings, so you'll need to scroll down the sensor window and capture the other sensors as well.
*Download HWinfo