IntelBurnTest is a wrapper around the [Wayback] Intel Linpack benchmark ([Wayback] Windows download) and still a great way to test CPUs.
From [Wayback/Archive.is] reddit – About Intel Burn Test… : overclocking:
“Pinhedd: “Both IBT and Prime95 are similar in that they stress floating point arithmetic and memory subsystems. They are different in that IBT uses Linpack (solving linear equations) while Prime95 calculates Mersene Primes.IBT is generally regarded as being far more aggressive in the short term, which makes it great for testing ultimate stability. IBT will easily drive load temps up to 20 degrees higher than Prime95, this is well known and is a defining feature of the program.Unfortunately, the Linpack benchmark was designed for supercomputers (hence the floating point part, for modeling continuous phenomenon) so it really pushes desktops to the limit, far beyond what any application will do. This means that IBT may fail on commercial CPUs that are running at stock settings simply because Intel doesn’t test them to that extent.
Too bad it is not open source and steadily at version 2.54, but then again, there is so little to maintain when the underlying tests basically do not change.