Originally Posted by Duality92
Ambient is usually <50, but if you mean 10 above ambient, sure
ambient is typically 20-30db but it does depend a LOT on where you live and if you have AC or something on. So yes, in some places it can be as high as 50db. last I checked with VERY amature equipment (this was why I offered to buy some better sound recording EQ and set a bar for you, as i'm not sure how accurate it was) the background noise when i built my rig was hovering around 20db. When I was done with my rig it failed to increase the noise in the room measurably when running prime95. The trick to VERY quiet rigs (something i've learned in 20 years of building systems) is to prevent your fans from creating the SAME sound wave frequency. you see two fans who are spinning the same speed from the same manufacturer and product, will typically "add" their noise together. So you keep "similar" fans to a min, mix up the type of fans, and then whenever possible mix up the speeds they spin at. This prevents the noise generated from "adding" together, and makes a quieter whole.
5 identical 10db fans spinning together at the same speeds will usually generate close to 50db of noise. 5 different fans spinning at different speeds usually will generate their noises at different frequencies and will not HARMONIZE and increase the total noise from the rig.
That's an affect i took advantage of in this build. I have 4 noctuas, 2 sets of 2 different models, with only 1 pair of noctuas spinning the same speed (different models though), I have 3 phantex with all 3 on separate fan curves. The result is unless i hit max RPM on the fans, and let them harmonize, they don't make any audible noise when spinning. There are NO mechanical drives in this system, the fan on the psu only spins when the psu is hot. 2 of the phanteks only spin when the internal case temps break 50C, the gpu fans don't spin as long as the gpu is <40C, and then the fan curve on the gpu fans is such that i've managed to make it so that they are basically impossible to hear over ambient. The cpu fan never spins up over 600 RPM (or atleast the cpu has never been hot enough to make it start to spin faster for the fan curve to ramp up the speed) and usually is spinning around 450RPM, at both speeds the cpu fan cannot be heard.
I did try to record the noise this pc made once i ironed out all the bugs, and i couldn't record a single sound from it from a foot away. It was clearly quieter then the ambient room noise. I could get a noise if i stuck the mic in the case, but no one's ear is going to be inside the case.
Anyway there is always many more tricks to making a quiet pc, and I don't think I know all of the tricks, but noise level IS a passion of mine, so i'm completely stoked about your build. REALLY want to see how quiet it gets and better still what type of overclocks you get. I know my build would have been louder with a better clocking CPU, which would have made it very hard with the not specialized not quiet cpu case I chose to quiet the build down.Edited by azanimefan - 8/17/16 at 4:18pm