MemHound - a RAM tester for a NAS you cannot stop (from StorageDiag Workbench & Utilities)

Pick the file for your NAS's CPU (uname -m): x86_64, aarch64 or armhf (or the archive with all three). Copy it to the
NAS, then over SSH:

  chmod +x memhound-x86_64
  ./memhound-x86_64 --ui2             the test with the boxed screen in 256 colours
  ./memhound-x86_64 --ui              the same in 16 colours, for a terminal without 256
  ./memhound-x86_64 --bench --ui2     memory bandwidth and latency benchmark, no fault test
  ./memhound-x86_64 --help            every option (--quick, --standard ...)

To test 100 % of the RAM, boot the NAS from the USB image instead: https://www.qnaputilities.com/pub/memhound/usb/
Static binaries, nothing to install. Unofficial software, not a QNAP product.