It seems, as the coolant temperatures, at least for the DB601, had to be always well below the boiling point, that the cooling system was unpressured under normal conditions, but able to hold pressure until the overpressure valve released.
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Win 7/64 Ult.; Phenom II X6 1100T; ASUS Crosshair IV; 16 GB DDR3/1600 Corsair; ASUS EAH6950/2GB; Logitech G940 & the usual suspects
 
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