Vents cut in top/side of the case (with dust filters). Noctua NH-L9x65 CPU cooler. CPU re-lidded (liquid metal on IHS). Now 90w CPUs run safely; Minifree sells i7-4790k.
32GB RAM + GPU upgrades (AMD Radeon RX 6400 on 9020 SFF and 6600XT on 9020 MT).
Libreboot replaces proprietary BIOS/UEFI. Debian Linux, other distro or BSD at your option e.g. OpenBSD, FreeBSD. I'm Libreboot's lead dev; sales fund Libreboot.
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