memory persistence

Persistent Memory (PMEM) is a non-volatile, byte-addressable memory tier: it delivers DRAM speed with the data retention of traditional storage.

This technology fundamentally changes the memory hierarchy. PMEM is a solid-state, high-performance solution that sits directly on the memory bus, allowing the CPU to access data with nanosecond latency, similar to DRAM. Unlike volatile RAM, PMEM retains data post-power-loss, eliminating the slow process of reloading from storage devices like SSDs. Early implementations, such as Intel Optane (using 3D XPoint DIMMs), demonstrated its value. Key use cases include high-speed fraud detection and supporting massive in-memory databases, like SAP HANA. This capability significantly improves application performance and system availability.

https://en.wikipedia.org/wiki/Persistent_memory