Those are nice fans. On the black ice pro 2, they are very quiet and move a decent amount of air...more air and much quieter than the delta 1212M's I had at 7v on my old heater core.
I'm running them on straight AC here (no pots or caps)...110v I suppose.
In my rig dT water/air is between 4-6C, depending on load (6c under cpuburn, 2415 MHz 1.95 Vcore, plus the OCed 9800p).
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