One script to overload PC (nVidia GPU + MEM + CPU)
Install watch, phoronix-test-suite (https://www.phoronix-test-suite.com/) and unigine-heaven* test, nvidia stuff, memtester, stress-ng, lm-sensors and GpuTest form http://www.Geeks3D.com/GpuTest/.
It is meant to stress whole PC, not benchmark it.
* It is probably possible to download Unigine's Heaven standalone (https://benchmark.unigine.com/heaven).