Would rowhammer testing reveal whether or not a system has ECC RAM? It reveals errors on my I7-4770K (not overclocked) system whereas an ancient Supermicro board (X10 era) seems to run the rowhammer test indefinitely w/out detecting errors. I suppose this won't work if newer systems have been designed not to be susceptible to rowhammer attacks.

Incidentally the RAM on a Raspberry Pi 4B (and CM4) is feported to use ECC RAM, but this is not the same as discussed here. It's on die ECC and the purpose is to improve yield of the chips. ECC errors are corrected and not reported via H/W. ECC errors that cannot be corrected (I suppose) are just read out as incorrect data. I wonder if modern RAM sticks use chips with on-die ECC.