There are probably billion dram chips in the world. And all of them need to be so perfect that a billion single cells are refreshed, read and written every few

There are probably billion dram chips in the world. And all of them need to be so perfect that a billion single cells are refreshed, read and written every few ns. It's very normal that sometimes a ram module breaks. That's the reason why ECC exist. ECC also exists btw for bit flip from space radiation.