If I were in this position I’d strongly consider using 16GB for the next year or two. Especially with an NVME SSD, good swap performance makes the impact of running out of memory much smaller than it used to be.

It’s very strange both sticks failed at the same time, have you tried them in another motherboard?

I had to do this on my busted ddr4 2 weeks ago. Badram didn’t work, but memmap did. I had to do bit flipping to get the translation from BADRAM as explained here.

I think the latest memtest86+ has the option to report in memmap format. But you will need to take a photo of the screen, coz it’s Foss and not as fancy as Passmarks memtest.

Edit: Adding badram to grub broke grub for me, I have to undo the grub config using a live boot rescue thingamajig. Then I went hunting why.

You can even make linux run an automatic memtest on boot and reserve the bad areas it finds. This is with the memtest=N kernel parameter, where N is the number of passes. memtest=17 tests all patterns. With this, the kernel will run an automatic test on every boot.

To add to what the above commenter said: afaik Grub allows specifying kernel parameters at boot by pressing some hotkey. You could type in the string from memtest86 if you find what the parameter should be called (or add the memtest parameter instead).