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I think the ideal rad would be 180*180*100, much like my two rads together... *but* also with a higher FPI - how much will that affect performance assuming constant air flow?
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This is moving away from the original goal of optimizing a radiator for a specific fan. Cath specified roughly 43cfm of flow with a pressure I'm too lazy to look up. For these given specifications, Caht's design works best. Increasing the frontal area, 180x180, might help performance. Increasing the depth to 100mm would actually hurt performance as it would reduce airflow. Increasing the FPI count might also hurt performance as it would also reduce airlow.
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I want the most airflow, for the least possible RPM, with the most possible pressure.
I think low rpm is important in reducing noise caused by bearings?
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I think we all do.

I was excited the first time I fired up a 12cm tornado, but the novalty wore off in about a minute as I began to lose my hearing. Until someone comes up with a maglev/magdrive fan we are stuck with traditional bearings/sleeves and traditional motors. Perhaps deeper fans with more blades and more curvature to the blades would help with back pressure. This is going into territory where I can only speculate.