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Old 05-01-2019, 07:06 PM
c-attack c-attack is online now
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Yeah, the SP140L are loud, I hate them, and thus this was likely part of the rationale to moving to a more civilized fan in the ML-Quiet. I would have put the A14i on the first day for your old H115i and in fact, that is exactly what I did.

Obviously airflow is dependent on fan speed, so a 140mm fan that moves 80 cfm at 2000 rpm will only move an estimated 40 cfm at 1000. In reality, the P-Q curve is not perfectly linear, but that is the best we can do without one. The same holds true for static pressure. Static pressure is the amount of negative pressure required to reduce a fan to a speed of zero. So the higher the RPM, the higher the static pressure. This does not directly equate into improved radiator performance. That little 40x40 fan that runs at 5000 rpm will have a staggering pressure rating, but still move a minuscule 11 cfm. Try that on your radiator. The ML140 Pro (2000 rpm max) I have in my hand right now rates at 100 cfm and 3.0 mm H20 at 2000 rpm. That is competitive with the like speed A14 industrial. The point I was making about is the ML140 Quiet is the same blade and frame and will move the same amount of air as the ML140 Pro when they are both at the same speed. The only limitation is the 1200 max speed and thus the remark about only needing it if you use it. At 700-900 rpm, all three are going be indistinguishable. At any rate, this was not a persuasive argument to switch your fans. Just don't toss the ML140-Quiets like you might the old SP140L. They have value. If you really want to see a ML vs A14i comparison across the RPM band, there are a few floating around the internet.

Yes, that is the general advice I give to others as well. Park the pump on Balanced and be done with it. You will (and should) be able to hear the Extreme 2850 rpm setting. My $200 D5 is certainly audible at 3000 rpm, even with a much more complicated dampening system. For most people, even with 200W+ HEDT CPUs, you won't see a coolant difference of more than 1C between the two higher speeds (2160/2850). You can certainly test that. If you are going to set a 30 minute render and leave the room, it hardly matters and can use it. If you have a lot of mixed use, put on balanced and leave it.

The cooler's fan controller was meant to use coolant temperature (H115i Pro Temp) as the control variable. If your coolant hits 60C, you have issues. In spite of this, Corsair has made CPU temp a control option and probably needs to adjust the graph scale to a more appropriate 80C+ to make reasonable data points. Since they have not, that is yet another reason to use coolant temperature as the control point. Remember, fans the pump speed have no effect on the electrical heat created under the CPU at the pins. The fans and pump do get rid of the waste heat conducted through CPU and cold plate. +1C coolant temp = +1 CPU temp. If the coolant is not going up during whatever you are doing, more fan or pump speed will not make it cooler. There is a definite minimum coolant temp you cannot get under. For most people that is ambient temp + 3-4C or most certainly case temp is you are top mounted.
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