Some possible talking points for follow up video
-Risers, USB vs Older Ribbon
-Sata Power Converters (They are rated at lower wattage then most cards pull and can get crispy)
-220V vs 120V gains
-Pros and cons of 19 GPU rig (what about failures and downtime)
-Hacking server power supplies
-Why are milk crates out of fashion! I love the ghetto rigs.
-It's not just OS limitations, but running with old Mobos sometimes has limitations, or requires jumpers for PCIe slots.