Join Date: Aug 2011
Location: Within the Milky Way
As an owner of a SS Prime Ultra Titanium, I can say that it's basically silent. I don't ever hear it in normal mode aside from the rare fan ramp-up. After what happened to eco mode on my p2 1200, I'm kinda weary of those passive modes, but it's not even needed on this unit because it's so quiet.
There is a new certification in town called the Lambda cert. that will grade the unit based on output noise. Cybernetic's ETA cert will grade the efficiency of the units as well. There is a database of all of the units they've tested, but it doesn't give the details of the specific models, just the brands. You can check the company's product page and hope that they have a lambda cert on there. If you want a super quiet one, then look out for the lambda a++ cert (ss prime ultra titaniums are).
1680 V2 4.5GHz 1.33v | G.Skill Trident X 4X4GB 2400MHz | R4BE | Titan Xp + Morpheus II
Wasabi Mango UHD550 | Rosewill Rise | Thermalright LGM RT
Logitech G600 | G440 | Tt Meka G-Unit Cherry MX Black+Double O-Rings
JBL LSR308s | Temblor T10 | Custom headphones | TEAC-UD501+Passive Preamp | Emotiva BasX A-100
OCZ Vertex 4 256GB | 51TB DAS | SS Prime Ultra Titanium 1KW