As I have also said above, +12.5% paid by the manufacturer of DIMM for memory chips may mean +10% in the price of DIMMs when they are not marked up excessively,

As I have also said above, +12.5% paid by the manufacturer of DIMM for memory chips may mean +10% in the price of DIMMs when they are not marked up excessively, like the DDR5 modules today. That +10% may become +5% after adding CPU, cooler, MB, PSU, case and it may become +3% after adding SSDs, a high-quality monitor and other usual peripherals. While at work I have seen plenty of problems with computers without ECC, for my desktops and servers and even for some laptops, when I could, I have used only ECC memory, for the last few decades. That has never increased the cost as much as I have saved by choosing wisely other components in the computers that I have built myself. The main problem has never been the extra cost, but the difficulty to find them exactly when I needed them, because at retail the availability of ECC modules may be sporadic and many distributors appear and disappear, so if I upgrade systems after some years I seldom can find the same source.