[RSS] IBM Power10 server (shipping since September 2021) users say their organizations achieved eight nines--99.999999%--of uptime. This is 315 milliseconds of unplanned, per server, per annum outage time due to underlying system flaws or component failures.

https://www.itjungle.com/2024/10/21/ibm-nears-the-end-of-the-road-for-server-reliability-improvements/

Pretty impressive numbers (not just from IBM) here