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For CPU stress testing, one of the oldest and best free CPU stress testing utilities is Prime95. Prime95 essentially utilizes the CPU to find Mersenne prime numbers and in the process, generates a very heavy workload on the CPU.What is the best stress test?
Other common candidates for stress testing include the CPU and the RAM. If you want to give your CPU a stress test, we recommend using an application like Prime95 or Aida64. RAM, meanwhile, is best tested with Memtest86, which is ideal for diagnosing RAM problems.What is a free GPU stress test?
Furmark (Free) Furmark is a controversial free GPU stress testing utility as it stresses the GPU by producing a complicated 3D image and when run for an extended period of time, it's been known to fry some older graphics cards that lacked certain voltage limit protections.