I have about 24TiB of RAM on the servers at work. We have had two sticks fail (both soon after purchase) in the last 10 years.

After the second, HP replaced all that we had from that batch.

HDDs fail every 3-6 months, there's a lot of them (3-4PB).

One PSU.

One CPU/motherboard. (I let the HP engineer handle that one.)

One NVMe drive.