ECC DIMMs won't outlast non-ECC in a server.

No meaningful difference in lifespan. Both types use the same DRAM chips and are rated for similar MTBF numbers (usually 1–2 million hours, which is over 100 years — but that’s a statistical estimate, not a warranty).

The extra chip for parity in ECC modules adds a tiny failure point, but it’s negligible. In practice, both will likely outlast the server’s useful life or be replaced during an upgrade. The real difference is data integrity: ECC catches and corrects single-bit memory errors, which non-ECC doesn’t. That matters in a 24/7 server. Lifespan? Not a factor.

Don’t choose ECC for longevity — choose it because you don’t want silent corruption corrupting your database at 3 AM.