It doesn't have to be that difficult. A crude yet effective method is to overclock the RAM beyond a reasonable frequency and a handful of correctable errors sho

It doesn't have to be that difficult. A crude yet effective method is to overclock the RAM beyond a reasonable frequency and a handful of correctable errors should pop up in no time. In case the OS/BIOS does not support overclocking or fails report memory error properly, certain data pins of the dimm slot could be physically shorted with metal wire to add a persistent stuck bit. Without ECC the system will not boot. I've seen it done on multiple occasions but web search is drawing a blank for the moment. IIRC it was being discussed a lot when first gen Ryzen cpu came out and people were arguing left and right whether ECC support is present on motherboard X. Finally some memtest software claims to be able to inject errors on a software level. I can't vouch for them as I have very little experience but it would be very simple to find out.