How I use MemTest to check if my RAM is working well
Using MemTest to test your RAM is much better than using the built-in Windows tool

RAM is usually one of the last components to fail. Your graphics card, hard drive, or motherboard are more likely to develop faults first. However, no matter how high-end your RAM, it's not immune to failing. If you're even experiencing weird behavior on your PC, such as unexplained slowdowns, crashes, or BSODs, faulty RAM is a possible suspect.