memtest86+ v6.0 Released As Rewritten Open-Source RAM Tester
Memtest86+ 6.0 as part of the rewrite now features proper UEFI support, the ability to stress the latest AMD and Intel platforms with both DDR4 and DDR5 memory module support, support for up to 256 CPU cores, and many other enhancements over the prior nine year old release.
memtest.org screenshot of a memtest86+ 6.0 development build for RAM testing.
Memtest86+ 6.0 can be downloaded in the form of Linux ISOs or a Windows USB installer. Memtest86+ is available from memtest.org. At least back in the day this was a wonderful program for testing system memory if fearing faulty DDR DIMMs or other memory related stability concerns.