Use splitter or fan controller.

This one is splitter or Y-adapter.
http://www.performance-pcs.com/catalog/ind...oducts_id=28414

OR directly connect to PSU:
http://www.performance-pcs.com/catalog/ind...products_id=603
cant control the fan if use this, unless you mod the splitter.

The splitter is very cheap, cheaper than a fan controller that is
Directly connect to PSU not loud, the fan will run at Maximum rated power. yeah its loud, any fan speed higher than 1200rpm mean loud for me
If i recall it correctly, Asus mobo can control the fan speed for each fan header, while Gigabyte only one, CPU fan header

IF the fans total ampere too high(most mobo only support 1A, MSi support up to 3A iirc.) for your mobo you will need to use the method below:
You can mod the splitter, Black wire connect to PSU, Red and Yellow connect to MOBO fan header.
all you need is just something sharp like needle or knife to push the clip from the connector(the silver thingy), press the silver clip and pull the wire slowly, dont use force else the clip will be left inside.

Image source: SPCR

Yeah you could try various configuration and see if its suits you. remember too much exhaust fan and if they are running at full speed, dust will enter your casing very easily.

Depend on the fans rated Ampere, most fan maker will put the info on the fan's sticker.
Most cheap pc fan usually are 0.1A to 0.3A, server fan will eat alot power, 1A to 3A and may be higher.

You can calculate the power yourself, eg 1A 12VDC fan = 12Watt.

PWM controlling may be more precise, although we still can use normal 3 pins fan, and mobo nowadays already support controlling the fan via PWM or Voltage.
Fan that support PWM controlling is quieter because it can go down to very low RPM, eg 600rpm at idle, even high ampere fan also can do that,

But controlling via voltage has limitation, the fan wont spin if the voltage provided by mobo too low at idle, or when start up the computer, eg 5V. high ampere fan will be noisy even at 5V.

Only if the fan controller support control pwm fan, or if the fan controller is rheostat-based, controlling by voltage.
RPM/3pin controlling wont work, the pwm fan will spin at full speed.

example of fan controller http://www.sunbeamtech.com/PRODUCTS/Rheosmart/6.html
http://www.zalman.co.kr/ENG/product/Product_Read.asp?idx=341

You can stack as long as you want.

what do you mean over drive?
i control 6 fans by only using one fan splitter, 2x 1.3A, 4x 0.75A, total 60W if the fan spin at fullblast

Vega duo or Trio?
never tried enermax fan though

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Added on May 21, 2011, 2:33 amdepend on RPM? higher rpm = higher airflow and static pressure + noise,
of course also depend on the fan blades design, thickness, dimension too.

This post has been edited by 1024kbps: May 21 2011, 02:33 AM

GT use dual ball bearing, not cheapo sleeve bearing, i doubt anyone would by such expensive fan which only could last for 30k hours if GT use sleeve bearing

Btw dont quite understand your last sentence,
SFLEX win GT motor noise? GT is quieter even at full speed, 1850rpm but lower CFM(60) compare to SFLEX G(1900rpm, 72cfm but f--king loud at full blast), many ppl said GT has higher static pressure.
SFLEX F, 1600rpm has similar CFM but its still noisy to my ears lol.

Sauce:
http://www.scythe-usa.com/product/acc/051/...1ap_detail.html
98 cubic meter per hour = 57.7 cubic feet per minutes, aka CFM.

there are many fans airflow are over 100CFM but mostly are thick fan, 38mm, or large fan hub.

AVC fans? i got 4 of them running on my casing, 2800rpm max, 120x120x25mm, CFM sure over 100 but its noisy + high ampere.
dun really remember the model name as they are quite long

Btw thick fan are more suitable to use as heatsink fan as the fan hub is smaller, less dead spot on heatsink unless you wanna install the fan shroud, but will make the fans more thicker LOL.
fan with big hug only can use as casing fan. imho.

This post has been edited by 1024kbps: Jul 27 2011, 08:10 PM

0.35A is low speed version, plus this one is only 3 pin.
Mine are this http://item.taobao.com/item.htm?id=10544577326
here are the translated spec:
Dimensions: 120mmX120mmX25mm
Bearing Type: TWO BALL
MTBF: 50000 hours
RPM: 3300
Airflow: 107.49 CFM
Noise: 46.5 dB(A)(PWM max temperature)
Voltage :12V DC
Ampere: 0.75 A
Wattage: 9.0 W
Connector type: 4pin
Fan speed monitoring: supported
cable length: 28 cm
net weight: 175 g

I own quite alot rare fans actually
Btw the RPM on spec is not accurate though, i have 4 of them, they only can max out at 2800RPM, one of them only can spin at 2500rpm.

This post has been edited by 1024kbps: Jul 28 2011, 08:18 PM

Only increase static pressure:
http://www.nmbtc.com/fans/engineering/multiple-fan-use.html
no airflow increased.

I own 2 of the AP 141 fans too, 14cm version, the airflow is very weak(63cfm) despite running at maximum speed, 1500rpm, of course its very noisy(cause placed behind the restrictive fan grills) plus the vibration noise = super loud.(thanks to my lousy flimsy cm690)

cannot use as intake fan because the airflow will be reduce further if use with dust filter...
duno about the airspeed...
prolly still usable if your casing still have plenty of space that still can put one or 2 of these silverstone AP fans, to push the hot air out of your casing.

Get a good casing, and some good fans, install them with correct position is the way to go.

Highest CFM? no noise limit?
buy this, http://www.itocp.com/htmls/19/n-3219-4.html
Nidec Beta V, you will become deaf for a while after you power up your pc with that fan installed, and after that noise shouldnt be a problem

If your casing can install 2 140mm fan on top as exhaust then you probably dont need high CFM fan.

A couple 1600 or 2000 RPM 120x25mm fan is enough, 60CFM to 90CFM, any higher you will need 140mm fan else the noise would be a problem since smaller fan always produce more fan noise than large fan.

cm 90cfm is fake one, especially the CFM rating lol, there are alot of better fans out there, Scythe and Arctic, for example.
Buy a better casing, CM690 aint bad too, if you want to keep your pc cool and quite.
buy 2 cheap 140cm fan as top exhaust guarantee will improve the casing ventilation. bottom and side panel as intake.

Gelid fan :http://www.gelidsolutions.com/products/index.php?lid=1&cid=2&id=56
Rare fan,
Or the most expensive one, non-pwm though: http://www.enermax.com/home.php?fn=eng/pro...4&lv1=38&no=126
even more expensive than my 260cfm san ace fan LOL

whats the ampere of the fans?
and how do you control it?

Well yeah, lamptron fan controller control fan by voltage, not pwm, thats why your fan had problem to starting up
High ampere fan usually will not start to spin untill they were supplied with enough voltage, eg 7V.
if controlled by pwm signal they will spin even at the lowest speed(but they still noisy though).

You didnt get my points
Eventually you will feel tired with fan noise lol, i used to control all the fans with fan controller, but over time it become hassle cause need to control manually
Now all my fans are controlled by mobo, i have 2 fan controllers, one is for testing fan only, the other Lamptron is collecting dust

PWM = http://en.wikipedia.org/wiki/Pulse-width_modulation
many fan maker will advertise their pwm fan as "quietest", because pwn fan can spin at lowest speed, compare to 3 pins fan, which are controller by voltage.
for example i have 2 delta fan, one is 3 pin and a pwm version.
if both fan speed are controlled by cpu fan software/bios, when your cpu is idle, pwm fan can go as low as 800 rpm(depend on model), and it does not have "cold-start" problem
while voltage controlled fan cannot do that, it will spin at at least 1500rpm(high ampere fan only lol) or higher to prevent the fan stopped spinning, some fan will simply stalled cause not enough voltage. and some 3 pin fan usually dont spin(eg noctua flx-p14), until your mobo/cpu warmed up(depend on start up voltage, and how you configure the fan setting via bios/software).