CPU – Prime 95
The granddaddy of CPU stress testing programs. Prime 95 can stress test your CPU and RAM at the same time.
RAM – Memtest86+
The easiest, no nonsense RAM tester. Tests all kinds of RAM.
GPU – Furmark
If your GPU can’t handle Furmark it probably doesn’t deserve to be in your system.
GPU – Unigine Heaven
This one is more of a benchmark program but if you loop the tests it becomes a stress test.
Use these tools to check system voltage, temperature, frequency and more.
This is a free hardware monitoring utility widely utilized and created by the same people who created CPU-Z. Shows you a wide variety of information in a lightweight package. HWMonitor is frequently updated to support the latest hardware.
This is another free hardware monitoring utility which shows even more detail than HWMonitor. Use this one if you really need to get into the nitty gritty.
This software is made specifically for Intel systems and is capable of CPU monitoring, overclocking and stress testing. What’s great is that the stress tests also include the memory and GPU providing additional utility.
This software is made specifically for AMD Ryzen CPU’s. You can expect similar functionality to that of Intel’s XTU software.