While memtest86 can get the CPU heated up a few degrees higher, it isn't touching the disk or GPU. I think that if you had something like Prime95 running with something else maxing out the GPU (Maybe something w/ BrookGPU) while trashing the HDs would be a good test (because these are the systems likely to run the hottest)...
better. add a GPU intensive but CPU light 'screen saver' / 'light show' that is triggered off the prime95 computation, so as much CPU as possible is dedicated to the lucas/lehmer tests, while its spitting out graphic instructions ....
the catch with graphics stuff is hardware glitches often go unnoticed, unless someones attention is carefully focused on the screen and the images being displayed are rational.
disk tests can be run as a foreground high priority seperate task, they are very IO intensive and use very little processor.
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