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Need help choosing fans for RX360

post #1 of 3
Thread Starter 
Hi, the title pretty much says it all, since I'll only be running a moderately overclocked i5 3570k and an EVGA GTX 670 FTW on this loop I don't need fans with massive cfm, and since the fpi count of the rad is low I also don't need ridiculously high static pressure. Ideally, I want near-silent fans, and have been looking at the Scythe Gentle Typhoons and Corsair SP series of fans, but '18dB' means little to me, as I can deal much better with a loud 'whoosh' than any sort of whine. Thanks in advance for your suggestions and advice = )

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post #2 of 3
I use Gentle Typhoon AP-14's on my 3 RX360 radiators. Even with all 18 fans going, it is VERY quiet. The nice thing about the GT's is that the noise that they do emit is not only low, but is a "Wrrrrrr" which I find isn't annoying.

Actually the loudest part of my loop are the 2 D5 pumps.

Let me pass on 2 things that may help you choose. One is a chart specific to the RX360 for fan speed vs heat dissipation, and the other is a noise calculator.


Quote:
Originally Posted by 47 Knucklehead View Post

You know you got computers on the brain when you are laying in bed at 2 in the morning and suddenly think to yourself ... OMG, how loud will this thing be? Should I have ordered 18 AP-13 or AP-12 fans instead?

Well, after running some numbers, it really doesn't matter much. Pretty much the most noise will be generated from the 2 MCP655 pumps, which puts out about 33dBA each.

9 800RPM fans AP-12 @ 9dBA = 18.54dBA (36.08dBA w/2 MCP655 pumps) = 28.25 CFM per = ~120 Watts @ 10C
18 800RPM fans AP-12 @ 9dBA = 21.52dBA (36.15dBA w/2 MCP655 pumps) = 28.25 CFM per = ~140 Watts @ 10C

9 1150RPM fans AP-13 @ 16dBA = 25.54dBA (36.37dBA w/2 MCP655 pumps) = 37 CFM per = ~160 Watts @ 10C
18 1150RPM fans AP-13 @ 16dBA = 28.52dBA (36.72dBA w/2 MCP655 pumps) = 37 CFM per = ~190 Watts @ 10C

9 1450RPM fans AP-14 @ 21dBA = 30.54dBA (37.08dBA w/2 MCP655 pumps) = 50 CFM per = ~215 Watts @ 10C
18 1450RPM fans AP-14 @ 21dBA = 33.52dBA (37.94dBA w/2 MCP655 pumps) = 50 CFM per = ~260 Watts @ 10C

For those that don't already have this site, you might want to book mark it. It is simply wonderful for calculating noise.

Combining decibels - up to 10 levels
Combining decibels − up to 30 levels


[Edit]

Here is a thread where myself and the builder talk about our experiences with the noise of lots of fans. I am using 18 AP-14's, he is using 32 AP-15's. We both agree, that both are very acceptable.

[Build Log] Fusion Reactor - First Water Cooling Build
Quote:
Originally Posted by ColdFusionWi View Post

I'll be completely honest with you, I do have a bit of a hearing problem but at full blast they are noticeable but I wouldn't say that they are loud. The other day when I was testing the new controller I had 24 fans hooked up to it; 16 on the rads in push/pull and 8 on the bottom of the case. With everything at full blast I could still hear the stock fans from my Antec 900 and the Scythe Slipstream on my CPU heatsink, also all set to full speed, over the 24 AP15's from across the room. The TH10 had both side panels off and the Antec had one side panel off. When I turned the pull fans to a 12 o'clock setting on the fan controller and all other fans to the 3 o'clock position it was pretty quiet to me. My wife even commented how much quieter it was compared to my existing PC.

I was a bit torn too as to which fans to use. One of the main reasons why I was looking at the Corsair's is because with the red insert it would have looked cool with the colors in my build. But I went with the AP15's because they are tried & true, just work, and work well. At some point in time I'll probably paint them but I don't mind the way they look at the moment.

Quote:
Originally Posted by 47 Knucklehead View Post

As far as having 32 of them at full speed, at 28bDA each, 32 of them will be roughly 43.02dBA.

While that isn't exactly "quiet", it does fall into the Center for Hearing and Communications category of "Quiet office, library" or "quiet residential area" (which is somewhere between "soft whisper" at 30dBA and "rainfall" at 50dBA).
Quote:
Originally Posted by ColdFusionWi View Post

Thanks for that information and for including those links. That may be useful to me some day. I think your description of what that sound level would be like is spot on to what I observed.

Edited by 47 Knucklehead - 11/3/12 at 4:45am
post #3 of 3
Thread Starter 
wow, thanks for that huge amount of information! I had no idea the decibel levels of so many fans are actually quite low when you do the math. I'm leaning towards the Gentle Typhoons now, unless anyone else has very positive experiences with the Corsair or other fans.
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