Originally Posted by breenemeister
I wonder how loud these would actually sound in practice? I have 4 of the 1850 RPM GTs in my ATCS 840 and they are the loudest part of the system until I'm at full load overclocked, even if I only have one of them running. I have them mounted with rubber O-rings to isolate them from the case. I think it has something to do with the frequency of the sound. The two PWM Akasa Vipers I have in push/pull on my Cogage True Spirit are noticeably quieter until they're totally maxed out, then they're about the same to slightly quieter to my ear (rated up to 28.9 dB). However, they're also rated for 83 cfm and 2.98 mm H2O static pressure. I'm guessing the 2150 RPM GTs would always be louder if on full. I wonder if the 29-30dB is accurate and how that will sound. I guess that's the price we pay for long life and good airflow. Don't get me wrong, the GTs are good fans, I just wonder about how others feel about the sound.
The dba on these is dead accurate. I might just be going deff to but i can barely hear the 1850s at all going at full tilt 24/7. The 2150s are only about 1 dba louder wich in most cases isn't even noticeable. The GTs are designed with a low frequency so you dont get that whining annoying sound you get with some fans. and i will quote this directly from the manufactures page
"Wide low-noise range (noise reduced in high density devices)
2-way vibration reduction (lowers resonant noise of entire device)
Energy Efficient (wide reduction compared to previous model)
Design to improve sound (for low speed applications)"
Also the dba rating on these is taken at 1 foot i believe so if you were to use the sound distance dampening equation r2 = r1 x 10(L1-L2)/20 your only looking at 16.9dba at 4 feet away and thats for the most part dead silence