Transcoding to RAM requires a pretty intimate understanding of how transcoding works in jellyfin, how big your original source videos are, etc. Not recommended for the faint of heart.
Jellyfin 10.10.6 (Docker)
Ubuntu 24.04.2 LTS w/HWE
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
4x WD Red Pro 6TB CMR in RAIDZ1