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180mm or 120mm. Air or motor noise?

post #1 of 4
Thread Starter 
Hi all,

At this point in time, I'm cooling an i7 950 and a GTX 580 from a Nova 1080 radiator (9x120). While the radiator does cool them, and not too badly, it doesn't leave a whole lot of room for overclocking. CPU/GPU load temps are around 55/60.

I'll be mounting the radiator to my case door soon-ish (as soon as I have enough money to buy a drill ) but I'm not sure as to my fan options.

I don't need a whole lot of airflow - I stuck a 1200RPM 120mm fan on the rad to see what it would do, and my temps dropped 10°. I'm looking at these two:

Gentle Typhoon AP-11 : 120mm, 18CFM, 500RPM, 5dBA

Phobya Silent-G : 180mm, 56CFM, 700RPM, 17dBA

I'm sure the GTs would be quieter, but because of the difference in size, is there likely to be a big difference in sound quality? Will the Phobyas create a "woosh" sound, with all the air they'll be moving, for example? (even at such a low speed.

Any other suggestions / comments?
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post #2 of 4
Thread Starter 
Anyone?
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post #3 of 4
Larger fans can move the same amount of air (CFM) than smaller fans with lower RPM. RPM noise (the fan spinning) is one component to over all fan noise (in addition to air noise). A 40CFM 120mm can be fairly quiet. a 40CFM 80mm can be quite loud. So, CFM for CFM, the larger fan will be quieter. (ever notice the specs on those 200mm fans and why they have such high CFM?). Hope this helps.
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post #4 of 4
While I can't speak for the Phobya fans, I do use a Silverstone FT02 with the original 180mm fans that operate at ~900 rpm. I've also played around with a multitude of fans. The noise from the 180mm fans are a lot more of a "whoosh" than it is a motor noise. The whoosh sound of a fan is pretty much always going to be there in my opinion (I don't think the notches advertise by Noctua fans actually reduce noise that dramatically). The motor noise is also a lot deeper than a smaller fan which will typically have a higher pitched motor noise. This is much better as the lower the frequency, the less irritating and noticeable it is to our ears.

On a side note, radiators that use 180mm fans vs 120 mm fans (assuming for the same overall dimension of the rad) should provide better cooling in theory.
    
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