> which price difference and speed difference are to be expected ECC RAM uses 1/8th more memory chips, so as a rule of thumb it costs 1/8th more. They can hav

> which price difference and speed difference are to be expected ECC RAM uses 1/8th more memory chips, so as a rule of thumb it costs 1/8th more. They can have very different dynamics on the used market though, because servers tend to be upgraded to larger modules over time, but there aren't many buyers for smaller modules. Not a big factor for DDR5 because it's too new, but for DDR4 you can get some great deals for 8GB and 16GB modules.