http://www.freescale.com/webapp/sps/site/overview.jsp?nodeId=0ST287482186253
In addition, MRAM endurance is unlimited, with no known or expected deterioration mechanism, while typical Flash endurance is only 105 write cycles. In applications where the speed of microprocessors is limited by the bottleneck of data transfer between nonvolatile memory and processor chips, MRAM is designed to remove the bottleneck by placing the high-speed nonvolatile memory directly in communications with the microprocessor.
freescale.com hovoří o nelimitované výdrži. (taky obchodní výraz "unlimited" co to je?)