Memtest 86 ran the whole night, not a single error found at 1880Mhz.
I boot into windows, LinX stops at an error after 5 minutes.

What's there to conclude now? Is Memtest (a very reliable program imo for finding errors) missing an error
or is LinX doing it wrong??

I'll try OCCT, also linpack stressing, wondering if it finds an error also.