Best quiet/performance 120mm fans for WC, some help please

[Ventrue]

I am ready for water cooling now, and reason is i need quiet.
I am currently using 2 TT smart fans cooling my CPU, one with temp sensor on top of my thermalright and the other set on minimal spin on the side case and they are loud for me. Ofcourse I have 5 (4 come with the case and 1 80mm vantec stealth) more fans in the case adding to the noice level. But I dont want move to water cool and find it will the same noice level again!
So I have decide to go for a Swiftech 350 for pump (good for silence)and now its all up to fan selection.
Because i am using my current case, a Lian Li PC65, i can only fit a Black Ice Pro in there (i hope). Therefore i need fans that can blow some decent air but quiet as well.
I read alot of threads in regards to fans and so far I have one question which i cant seem to find.
When ppl say under volt fan can reduce the noice. Is it safe to assume the dbA and cfm will reduce in ratio with RPM? If it is I find the delta's latest 220cfm fan to be the best cfm / dbA ratio at 1500rmp in comparison with say the likes of Panaflow, Sunon, Evercool, Papst, etc

Also if I use 2 fans for push and pull on the rad, does the dbA output double? e.g. 22 dbA become 44 dbA for 2 fans?

Thanks for reading

 

[sunrunner20]

I am ready for water cooling now, and reason is i need quiet.
I am currently using 2 TT smart fans cooling my CPU, one with temp sensor on top of my thermalright and the other set on minimal spin on the side case and they are loud for me. Ofcourse I have 5 (4 come with the case and 1 80mm vantec stealth) more fans in the case adding to the noice level. But I dont want move to water cool and find it will the same noice level again!
So I have decide to go for a Swiftech 350 for pump (good for silence)and now its all up to fan selection.
Because i am using my current case, a Lian Li PC65, i can only fit a Black Ice Pro in there (i hope). Therefore i need fans that can blow some decent air but quiet as well.
I read alot of threads in regards to fans and so far I have one question which i cant seem to find.
When ppl say under volt fan can reduce the noice. Is it safe to assume the dbA and cfm will reduce in ratio with RPM? If it is I find the delta's latest 220cfm fan to be the best cfm / dbA ratio at 1500rmp in comparison with say the likes of Panaflow, Sunon, Evercool, Papst, etc

Also if I use 2 fans for push and pull on the rad, does the dbA output double? e.g. 22 dbA become 44 dbA for 2 fans?

Thanks for reading

1. I don't know what fans are aviable now, but I know I love my 120mm Sanyo Denki's.
2. When undervolting theory says that CFM is proportional to the RPM at full speed(12v. Say its 12k RPM, you undervolt it untill its 1k rpm, You have 1/12th the air flow)
3. Sound is not measured linearly. Two fans of 22DBa would end up with something like 24DBa. Its something like that I'm no expert in sound levels yet.

 

[tinker77]

yup, I would have to say sanyo denki too. They are hard to find but they are still around.

 

[Ven0m]

Nexus and Glacialtech fans are pretty cool, but they rotate around 1000RPM
If you look for something a little faster, you might check Sanyo Denki and 3-blade Deltas, as well as a few other like Panaflo. I'd recommend checking silentpcreview and Delta datasheets.

Push/pull configuration should produce less noise than 1 fan moving same amount of air. Spacers decrease noise too. If you can get Lada heatercore, it might be pretty good - it has very low air restriction, what results in decreased noise.

 

[Pollux]

The 120x38mm Panaflo has a really good cfm to noise ratio.

 

[Ventrue]

What about this?

THis is the site i find the delta, have a look,
http://www.sidewindercomputers.com/de12tfexhisp.html

What do you think the dbA and cfm might be for this fan if undervolt to 5v?

 

[Ventrue]

I would like to keep it under 25dbA after under volt. My ears cant hear that loud! And i like to keep the cfm around the 60 to 70 mark.

Any suggestion?

 

[Ventrue]

Thanks for the info!

Now i just need to know which fan to under volt for the best result!

 

[squirtle632]

Delta WFE1212M is my weapon of choise.
Slight PWM tick when going all the way to 5 volt but they never fail to start up.
@ 7 volt they still move decent air and quiet. Estimates of about 28db. Lets put it this way.... my window fan on low being 4 feet from me is louder than 3 Deltas running at 7 volt and 2 feet from me