In that case, you will only have to hard reboot your system. If your GPU is stable, everything will be fine otherwise, you may see graphic artifacts on screen or your system may even crash or become unresponsive. Anything other than the furry object is an artifact.

Observe the furry object carefully for any artifacts. Increasing the fan speed to 80% or even more is recommended before running Kombustor. But you have to closely monitor the temperature as this test will produce unrealistic load on the GPU and as a result, the core temperature will skyrocket. Let it run for 2 hours (just 10 minute is enough if you have just started to find the max overclock by increasing the core/shader in small increments at a time). This will invoke a furry object on screen which actually does the stressing. Under Burn-in test, select Xtreme burn-in.To stress test your graphic card, you need the following tools. How to make sure your overclock is stable In continuation with my previous blog post on GPU Overclocking, where I explained how to overclock your graphic card, I’m going to discuss how to stress test a GPU to ensure stability. If you have already reached the wall, do a test for 2 hours. If you have just started overclocking by increasing the clocks in increments, a 10 minute test is sufficient so that you can try pushing you graphic card more. Stress testing or torture testing your overclocked GPU is extremely important to ensure it runs stable all the time. Stress Testing a Graphic Card – GPU Stress Testing

Msi kombustor stress test duration