IntelBurnTest: Another popular option for testing CPUs. IntelBurnTest uses the same stress-testing engine that Intel uses internally for quality control before shipping out CPUs. The program also claims to perform the necessary tests in 8 minutes, as opposed to 3+ hours with Prime95.
For a slightly more obscure option, there’s also
Super PI, a single-threaded benchmark that calculates the number pi up to a specified number of digits (with a maximum of 32 million). It’s not the ideal stress test for multi-core CPUs, but it can still give you a good idea of how your PC will handle single-threaded tasks. It’s also not a bad frame of reference for PC gaming performance.
GPU testing
FurMark: An extremely popular graphics stress test. This program should push your graphics card harder than even the most demanding game on the market. If your GPU has problems, you should know within about 15 minutes.