206
New Raspberry Pi 5 comes with PCIe 2.0 x1 interface and power button
(www.raspberrypi.com)
This is a most excellent place for technology news and articles.
It does and I used to briefly run a ZFS pool on a Pi 4 in 2019. I only abandoned it due to a nasty deadlock bug that I think got resolved sometime ago. Non-ECC RAM shouldn't be significantly worse than using say MDRAID or Btrfs with non-ECC RAM.