I upgraded my i5-8500 to an i9-9900 which have same TDP of 65w. However the i9 processor keeps shutting down when starting to do more intense processing. I have eliminated main power supply as potential issue because when reverting back to the i5 there is no problem in running the Intel Diagnostic programme but i9 shuts down half way through the test. I’m wondering if there is a Bios setting I can adjust. I am also using a fanless system. Thanks in advance, Jay.
The system could be powering off because of overheating or because of power draw (though this usually results in throttling, not power off). There may be related parameters in the BIOS but we cannot ascertain that. First step should be to run software that monitors temperatures and see if the processor is overheating. I recommend AIDA64, since this has support for monitoring temperatures while running a built-in stress test. This is not a free app, but it does allow you to test it for a trial period without purchase.
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Intel Customer Support Technician