the only proper (other than radically redesigning geometry and topology of whole ram chip, probably losing capacity in the process) protection (known in the ind

the only proper (other than radically redesigning geometry and topology of whole ram chip, probably losing capacity in the process) protection (known in the industry since middle nineties ...) is access counter per row inside the ram module or memory controller. But that would cost additional $0.1 per chip!!!1 :/