[Trekari]

Some are 2-pass, some are 4-pass, others are single-pass. Black Ice Pro is a 4-pass, but only an inch thick, Black Ice eXtreme is a 2-pass, but nearly 2" thick.

Which is better? The thicker the radiator, the higher speed (and thus noisier) fans are required to get the air to flow through the fins, correct?

The more passes a radiator has, the larger the pressure drop, but also the more time the coolant is exposed to the cooling fins, right?

Radiators perform better as you increase the difference between the coolant temperature and the ambient temperature, so would this mean a single, dual-fan radiator would perform better than two, single fan radiators in parallel or series given a multiple-block setup where one radiator is used for each waterblock?

Given a low-noise desire for a watercooling setup, do car heatercores actually perform better? One would think that the greater airflow resistance offered by the thicker heatercores would actually increase noise due to turbulance(sp?) created by all the fins.

For maximum cooling potential, would a 4-pass, thick radiator do better than a single-pass?

-Jason