To quote DrRom, "I'm running the 172w with 18v from a switchmode PSU - higher voltages offered no cooling improvements for me at all."
He didn't say that he found 18V to be the optimal voltage to run at. He only said that running at higher voltages was useless or worse.
The simulations I've done, show 16V to 17V to be the optimal place to operate with "good" watercooling. "Extremely good" watercooling might get the optimal operating voltage up to 20V.
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