Currently, my custom rig with 2 360 radiators and 6 Gentle typhoons at 1400RPM and 1 MCP655 pump is barely noticeable, but you can hear it. I'm re-working that system now to add another 360 radiator and adding a total of 18 Gentle Tyhoon 1450RPM fans and adding a 2nd MCP655 pump. I expect the noise to be more, but the calculated noise level SHOULDN'T be too bad.
I crunched the numbers and here is what I came up with:
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 levelsCombining decibels − up to 30 levels
(From my build log: The Betty
I've also just gotten new water cooling kit for my TC Folding rig and I've running that on the bench now, and I honestly can't hear it at all beyond 2 feet away.[Build Log] Project White Ranger - 24/7 Team Competition i7 Folder