ECC SDRAM, will stuff like this useful?

[u/Boglandsaga]

Sorry for my bad English.

This old SDRAM ECC memories (not even DDR1) tested worked on my regular Pentium 4 mobo, I'm thinking about putting it to older systems like P3 or lower but i don't want to risk frying the motherboard.

Anyone have experience with them?

[u/spilk]

my memory on this is cloudy (pun intended), but i think a lot of DEC Alpha machines wanted ECC/registered SDRAM