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As parent said "painted metal". In this video showing how pc cases is made[0]. They mention they automate the powder coating of paint. So the external case sho

• Animats 8y ago
  As parent said "painted metal". Look at the pictures in the original article. He built his open racks from multiple painted metal parts. The metal parts probably don't provide a solid path to ground. Connecting the ground stake to a big piece of metal that's not grounded adds an antenna to the thing and makes emissions worse. Easy to fix. Use a Dremel tool and grind off the paint where the stake is screwed into the metal rail. Use jumper wires (properly, green ones) and crimped screw lugs to connect the rails together. Connect those to something that has a grounded case. Check with an ohmmeter to see that there's continuity between the metal cooling plate on the GPU and the ground pin of what plugs into the wall. Should be less than 1 ohm. Use an outlet tester to make sure your wall outlet has a valid ground pin. Now most of your RF hash gets clamped by the tie to ground.