It's 700 RPM which is rotations per minute. Not per second.

Generally, the larger the fan, the more airflow it will produce given the same RPM compared to a smaller fan. Just imagine the fan blades as being a ladle, and the air being soup. A larger ladle means you'll have to scoop less times to transfer 1 litre of soup compared to a small ladle. That's why for silent or quite setups, people go for larger fans like 120 or 140 mm case fans. Although they may spin at a lower RPM compared to 80 or 90 mm fans, they can generate the same amount of airflow, and logically, if operated at the same rpm, the 120 mm fans will push more air compared to a 90 mm fan.

In example, a 90mm fan may be noisy at 2000 RPM, and quiet at 1200 RPM, but at 1200 RPM, the air-flow is not good. The solution to get satisfactory airflow is to:

a. But a super silent but high airflow 90mm fan, which will probably cost a lot, and they don't really exist anyway, due to limits of physics
b. Change to a 120 mm fan and run it at 1200 RPM for better airflow, but no (or hardly any) increase in noise.

That's just a general example, but generally, that's how it works. ( =

This post has been edited by RahXeph0n: Apr 11 2008, 02:30 AM

all bottom and side intake. back exshaut.

any of the sifoo here use icute's 120mm fan before? the black colour type... ok o not the flow rate?

and another thing, i read before some where saying that the exhaust fan must have higher cfm than any other intake fans to avoid heated air circulating inside... is this true?

This post has been edited by capiche: Apr 11 2008, 05:06 PM

hey guys i wan to know i see u guys put so many fans not noisy ?? mine got 3only and the noisy is a bit loud ?? what should i do ?

use good fan that has better CFM over dBA ratio..

means .. more airflow at the same amount of noise output by the fan ...

It's usually expensive ... about RM60 and above .. such as Noctua and Scythe Flex .... a cheaper brand would be Yate Loon but all three are hard to get in MY ....

Hmm...guys...I getting a CM Elite 331 -non moded soon...So any idea what fan should I install in???Silences fan =D

if it's not a high heat producing PC ...probably cooler master fans are just nice ..

it's comparable quiet but pushes lesser amount of air ...

if really want good quiet fan have to fork out RM60 for each ....

When you get the casing, check the rear case fan. Buy another one and put at the front. Should already be sufficient

For quiet cooling:

Never buy smaller than 12 cm fans

If your fans cannot be plugged into the mobo, make sure on 12v (MOSFET connector) they are rated to not spin at high RPMs. For example, Cooler Master silent fans spin at 1200 RPM on 12v, which is quiet enough for me, with decent airflow ( decent airflow since I have 3 intake fans and 3 exhaust fans). Otherwise, you have to buy or mod your own 5 or 7 volt MOSFET connectors. Generally for cooler master silent fans, 2000 rpm is audible, and 700 is too slow (i tested using the mobo speed controller) so 1200 RPM hits the sweet spot for me.

Having fan speed regulators will really remove the major headache of noise vs performance. Then you can increase or lower an speeds as and when you need performance, or silence. They may cost quite a bit, but it's a good investment, if you don't mind how they look (most of the affordable ones are ugly and do not fit my casing's look, so I didn't get one)

Noise can also be caused by vibrations, so your mounting process should be considered as well. A rated silent fan won't be so silent if it's only mounted using cable-ties to a CD-ROM bay grill.




As Doom said, If you're not overclocking though, then don't bother with too many fans. your pc should function just fine. Adding fans = more dust = more maintenance required. Go for Prod's suggestion of 1 front intake and one rear exhaust should be sufficient.

This post has been edited by RahXeph0n: Apr 14 2008, 06:14 PM

Oh...okie =D...can CM elite 311 install a fan at the side???how many cm fan can it fit?and it is advisable to fit a fan there???and if yes...the fan intake or release air from casing??

I assume you mean the 331, can't find any 311. haha! Well, yes there are side intake vents. I call them intakes because my previous casing had similar vents, and with my setup and mobo design, you can feel air being sucked in the side and not expelled. The lower vent however, might depend on your graphic card. For example, my 8800 gts 512 is a dual slot card, which sucks air from the back end of the card ( the end that faces the HDD racks) and expells air out at the dvi ports (the back of the pc chasis). Some graphic cards operate differently however, and the airflow migt be different. I suggest before you buy any fans, take a thin strip of tissue paper, and test the general airflow direction of the casing first.

From what I gather, there's only proper mountings for a front intake fan (a filter is provided, so don't have to worry about dust) and a read exhaust fan. I suggest to stick to these. Only put an intake fan at the side if you can confirm it's an intake vent. Otherwise, you may just mess up the graphic card airflow. If you're willing to do some modding, bottom intake and top exhaust really really help in cooling, but I'm not sure if your casing dimensions will allow that. Note that putting an intake fan at the side might be limited due to the ready made perforations of the side pane. Maybe buy a cheapo no-brand 12 and 9 cm fan to see if the screw holes can align.

Another note, if yo are changing to a third party heat sink/fan for your processor, the fan orientation will affect airflow too.

Wow..is kinda complicated >.<...okie=D...will try it once I get the new pc...haha...cant wait to get it...

C2D E6550
DFI Blood Iron p35-t2RL
Kingston DDR2 667 2gb
Seagate 160gb sata 8mb
Galaxy 8800GT DDR3 512MB
Silverstone Strider 560W
CM elite 331 = rm 141
Samsung 19" 931BW = rm 689
Creative M5300 (5.1) = rm 299

Hope Elite 331 can give me a good air flow...lol...

If I were you, I'd scrap the soundcard and get a better harddrive + a CM690 only extra RM80 for the CM690. (RM220 At www.yeahstore.com) or at least, order the CM590. much better airflow with top blow off vents as well.

Unless you really have high quality 5 channel speakers (or your mobo no onboard sound), I really don't see the point.

Creative M5300 (5.1) is actually 5.1 speaker...but now i plan to change to 4.1 wan...It is not soundcard...coz soundcard is alreadly built in...=D

My bad. hahaha. Just assumed.

Is there anyway to get fan filter?

You can either make it yourself or buy la.

Question: Would daisy chaining a bunch of fans using molex connectors affect it's voltage or amp? Meaning if I stick a fan into a molex connector and connect that to the PSU molex rail, then from the connector I conenct another fan to another fan etc.

Something like this:


Want to know if my fans are going at the right RPM haha

This post has been edited by RahXeph0n: Apr 16 2008, 07:12 PM

Guys can someone recomend me some fans. I wanna bling up my CM690.I plan to get a few CM Red Led 120mm fans and red color CCFL. But right now CM fans everywhere no stock so im trying to find out alternatives if there is any

cool