Though there is a CPU "Burner" stress test option in Furmark, it is really designed to stress the GPU.
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For IBT to be a reliable indicator of overclock stability you need to run it in at least "High" stress test mode and increase the iteration cycle number from 10 to like 30. Even so, there are better stress testers out there for modern CPUs that apply more realistic stress test methods. The latest version of IBT came out back in 2012. IBT is really a "burner" that produces very high temps when configured so as to really do a good job.