I can't run my fans at 12v, too damn loud. My room is very small I guess that's why and I have Sunon Quite 120mm fan with spacers between radiator and it. I use 4.5v and 6.0v, 6.0 in q3 and pc stays stable, a bit warm but stable.
Antifreeze helps to prevent corrosion and such just like water wetter, they do good together. And if I'll add a peltier to my resevoir eventually (inline) it'll help.
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