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post #41 of 58
Quote:
Originally Posted by ehume View Post

These are summary graphs. The sound measurements were made 10cm to the side of the center fan. This was done to capture the differences between center fans as well as to compare the SPL's when there was no fan in the middle (look at all the chapters of item 4 in my sig; it was a long run).

The noise the push fans make is much more variable. And yes, the difference between an AP-30 and an R4 is significant. Look to item 1 in my sig to get a handle on that.

As for fan speeds, there is often great variability. Sellers typically promise plus or minus fifteen percent of the rated rpm.


Okay. Thanks for your reply. I know that between AP 30 et R4 there isa big difference, but AP15 should be in the same range?

if you had to choose between the R4 and the XSPC 120mm 1650rpm, which one you would take for heatsink, and for case fan?
post #42 of 58
Thread Starter 
Quote:
Originally Posted by ChristTheGreat View Post

Quote:
Originally Posted by ehume View Post

These are summary graphs. The sound measurements were made 10cm to the side of the center fan. This was done to capture the differences between center fans as well as to compare the SPL's when there was no fan in the middle (look at all the chapters of item 4 in my sig; it was a long run).

The noise the push fans make is much more variable. And yes, the difference between an AP-30 and an R4 is significant. Look to item 1 in my sig to get a handle on that.

As for fan speeds, there is often great variability. Sellers typically promise plus or minus fifteen percent of the rated rpm.


Okay. Thanks for your reply. I know that between AP 30 et R4 there isa big difference, but AP15 should be in the same range?

if you had to choose between the R4 and the XSPC 120mm 1650rpm, which one you would take for heatsink, and for case fan?



Typo. I meant to say there is a big difference between the R4 and the AP-15.

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post #43 of 58
haha okay =)
post #44 of 58
Quote:
Originally Posted by KhaoticKomputing View Post

Yea, it take's a few more volts to start the fan than it dose to maintain its lowest operational RPM. But its not going to be a whole lot. When you have to worry is when High speed fans, or 120*38mm fan's are used, they can pull some power. but a standerd 120*25mm fan wont pull a whole lot, even at start up. I have looked all over and cannot find any power ratings on the XSPC fans:(
Quote:
Originally Posted by ehume View Post

From the labels: 1200 and 1650 rpm: 0.18A
RCL1225S 2000 rpm and 1425S: 0.23A

I added the data to the OP.

Hey guys, so is the general consensus that two of these fans would be ok then?

I think to work out watts you times amps by volts? So 0.18A*12v= 2.16W *2 = 4.32W for both fans?

Does that make sense?

I would have thought a fan header could offer more than that? The CPU fan header offers 24W, so I would have thought an normal chassis fan header would have offered maybe 12W?
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post #45 of 58
Quote:
Originally Posted by Matt26LFC View Post

Hey guys, so is the general consensus that two of these fans would be ok then?
I think to work out watts you times amps by volts? So 0.18A*12v= 2.16W *2 = 4.32W for both fans?
Does that make sense?
I would have thought a fan header could offer more than that? The CPU fan header offers 24W, so I would have thought an normal chassis fan header would have offered maybe 12W?

I have no idea if your doing your math right, or if that is the right equation for getting the proper wattage. I have always googed it lol. I oculd understand making a CPU fan header a little stonger than a system fan header. more and more people are using Y pins to run dual fan CPU coolers of a single Mobo header. Seem's fine to me.
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post #46 of 58
Sweet review! How do these undervolt? Any ticking sound and the like? Voltage control or PWM?

Also, say I wanted to run my fans at 1200 rpm, maybe even 1000 rpm. Would I be better with the 1200, 1650 or 2000 ones (let's say they can go that low)? Generally speaking, is it better to get a high rpm fan (more solidly built?) fan and undervolt it, or go with the one having the closest rpm to what one is interested into?

Sorry to throw this out here, but this question has been bugging me or a while, and this thread seems to get the attention of peeps in the know biggrin.gif
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post #47 of 58
Quote:
Originally Posted by TwentyCent View Post

Sweet review! How do these undervolt? Any ticking sound and the like? Voltage control or PWM?
Also, say I wanted to run my fans at 1200 rpm, maybe even 1000 rpm. Would I be better with the 1200, 1650 or 2000 ones (let's say they can go that low)? Generally speaking, is it better to get a high rpm fan (more solidly built?) fan and undervolt it, or go with the one having the closest rpm to what one is interested into?
Sorry to throw this out here, but this question has been bugging me or a while, and this thread seems to get the attention of peeps in the know biggrin.gif

I only have experience with 2000 rpm model from Swiftech, those start up at something like 4.8 V. On 5 V they run at 800 rpm and are very quiet, no ticking that I can hear.
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post #48 of 58
Thread Starter 

I forgot to test them undervolted. :facepalm:

 

Although most controllers are rated in Watts (for our purposes, Amps x Volts = Watts), most fan header limits are stated in Amps. So my Gigabyte boards have a 1-Amp limit (I emailed Gigabyte to find out) and my As.s board has a 2-Amp limit (it's in the manual). So for figuring out what you can put on your mb header, add Amps to get total current draw.

 

These are not PWM fans, so they are Voltage controlled.

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post #49 of 58
Thanks for getting back ehume. I mentionned voltage/pwm because while some fan controllers rely on voltage control (they tend to have heatsinks it seems), a lot of them actually rely on a pwm signal to control fan rotation (on/off signal...). I remember when the NZXT Sentry 2 got out, people had ticking problems with their fan, due to the nature of the Sentry's control (PWM style). I was therefore asking if the XSPC fans suffered from such a type of controlling vs. voltage.
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post #50 of 58
Thread Starter 

At 5v the 1200 rpm XSPC fan has only faint clicking. The 1650 rpm has quiet clicking. The 2000 rpm has fast quiet clicking.

 

I use single-channel fan controllers. At intermediate Voltages the 1200 is faint, the 1650 is quiet, the 2000 rpm fast quiet. For all of them the clicking disappears as they reach full speed.

 

If you listen closely the 2000 clicking is distinct at intermediate speeds. None of them are objectionable.

 

 

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