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The trick is to use ECO mode. I had no problems here with a 3900X the L9a + fan duct or Thermalright AXP90 Copper in Chinebench or Gaming.

For best temps get the AXP90 Copper.

Keep in mind that the 5950x and 5900x will stay cooler in ECO mode than the 5800x because of its DIE configuration.