Intel has identified an issue that potentially affects the 6th Gen Intel® Core™ family of products. This issue only occurs under certain complex workload conditions, like those that may be encountered when running applications like Prime95. We have not experienced any issues with the 4th Generation Intel® Core™ i5 Processors and Prime95.
Just bear in mind that Intel does not validate third party tools as per diagnosing our products. I invite you running the Intel® Processor Diagnostic Tool, see here for the download Download Intel® Processor Diagnostic Tool.