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Round 6 Fan Testing (Working Thread) - Page 26

post #251 of 476
Wow that delta is actually a very decent fan when slowed down. It could be a nice every day fan 24/7 and still allow you to unleash the fury during OC sessions. I might have to buy 2 of them now...
    
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post #252 of 476
Martin, do you have any experience with the number of PWM fans you could run off the CPU header. Just the PWM signal, not the +12.

I would like to make something like the Akasa PWM splitter but for 6, 8, or even 10 fans so that my rad fans auto adjust with temp so I don't have to manually adjust my fans. I just don't know how many I can chain off the PWM signal of my mobo.



Another idea I had was to try and build a custom thermal PWM circuit like the Maxim-IC 6639 here



You have any experience with any of this?
post #253 of 476
Quote:
Originally Posted by Martinm210 View Post
Like this?, I might put in an order:
http://www.frozencpu.com/products/85...?tl=g36c15s562
Yep, thats the one, and also it has other 25mm thick sibling same AFx series but with PWM -> http://www.frozencpu.com/products/85...l?tl=g36c15s69

Btw, I heavily suggest you not to order any classic 3 wires fan anymore, the 4 wires pwm fan is the way to go and will be the de facto standard in the future. With pwm fan, at slowing them, the efficiency reached almost above 90% or sometimes > 95% and with minimal impact on noise such as ticking on most cases at medium to high quality fan.

.
Edited by Bing - 11/24/10 at 7:29pm
post #254 of 476
Thread Starter 
Quote:
Originally Posted by RatDog View Post
Martin, do you have any experience with the number of PWM fans you could run off the CPU header. Just the PWM signal, not the +12.

I would like to make something like the Akasa PWM splitter but for 6, 8, or even 10 fans so that my rad fans auto adjust with temp so I don't have to manually adjust my fans. I just don't know how many I can chain off the PWM signal of my mobo.



Another idea I had was to try and build a custom thermal PWM circuit like the Maxim-IC 6639 here



You have any experience with any of this?
I don't but I'm really interest in PWM. I built the controller Bing helped me with and would really like to do exactly what you are saying.

Quote:
Originally Posted by Bing View Post
Yep, thats the one, and also it has other 25mm thick sibling same AFx series but with PWM -> http://www.frozencpu.com/products/85...l?tl=g36c15s69

Btw, I heavily suggest you not to order any classic 3 wires fan anymore, the 4 wires pwm fan is the way to go and will be the de facto standard in the future. With pwm fan, at slowing them, the efficiency reached almost above 90% or sometimes > 95% and with minimal impact on noise such as ticking on most cases at medium to high quality fan.

.
Do you know if there is any difference with the rev3 models? The VHE I tested was specified at sidewinders as rev3 and the little notches in the hub look different than any other pictures I'm seeing. I was leaning toward a 3 pin AFBHE for voltage control, and maybe than PWM variety..but I haven't hit the button just yet..
    
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post #255 of 476
Quote:
Originally Posted by Martinm210 View Post
Do you know if there is any difference with the rev3 models? The VHE I tested was specified at sidewinders as rev3 and the little notches in the hub look different than any other pictures I'm seeing. I was leaning toward a 3 pin AFBHE for voltage control, and maybe than PWM variety..but I haven't hit the button just yet..
Not sure, regarding Delta revisions, it looks like they never released any official documents about it and they kinda vague.

Delta's official datasheet on AF series can be found here -> http://www.delta.com.tw/product/cp/d...?pcid=1&ptid=1

Regarding naming, usually the 3rd character B is for retail market and most of them are 3 wires fan, while C is for OEM with PWM feature. e.g : AFB1212xx vs AFC1212xx and etc.
post #256 of 476
Quote:
Originally Posted by RatDog View Post
Martin, do you have any experience with the number of PWM fans you could run off the CPU header. Just the PWM signal, not the +12.
Ratdog, yes, its possible, the PWM signal from the mobo header (pin 4) can be shared on number of fans and all fans (assuming exact same fans) will run at the same power or very similar speed if they have the same obstruction/load level. Thats the other advantage of using pwm fan.

Of course the RPM sensor on each fan should be connected at different mobo headers since these rpm signal can not be join together. In your situation, I assume they're mounted at the same radiator, hence all will have the same load/obstruction level, then just pick one of the fan's rpm signal and connect it to one of the mobo header at pin 3 (rpm reporting), imo this single fan's rpm speed should be enough to represent all other identical fans.

About how many fans can be connected at single PWM signal source from the mobo or from controller, 5 to 10 should be fine, as long all those fans maker are following the standard PWM specification released by formfactors.org. Just try it out and its quite safe as long you don't mis-wired them to see if its capable of drive all of your fans.

Should you have any problem on driving too many fans, PM me, I will help you on another circuit to boost/amplify the PWM signal, so it will be powerful enough that capable to drive probably 30 to 40 fans.
post #257 of 476
I am appreciating this thread as a reference more and more as time goes on.

Your contributions are greatly appreciated
post #258 of 476
@Bing

Well, I have a mix of Scythe 1600 and 1900 fans across my 360 and 120 rads. so I was considering buying new PWM fans that could vary from near silent when I am doing work and spin up when I am gaming or loading up the PC.

Do you or Martin have a suggestion on the best 120mm PWM fan. I want something that could go slow such as 200 - 500 RPM when there is minimal load but ramp up high 1500 - 2000 rpm when under full load. I was giving the eye to the Scythe Slipstream SY1225SL12H-P. Supposed to go from 7.5 dba at 500 rpm / 24 CFM to 37 dba at 1900 RPM / 110 CFM.

I run a Swiftech 360 rad with push / pull fans and Feser 120 rad with pull fan (no space) for what it is worth.
post #259 of 476
Thread Starter 
I'm not sure on the PWM setup, probably depends how strong you need it. The Arctic Cooling F12 is doing well on voltage, and I plan to do sort of a PWM shootout at the end here...just havn't done it yet.

Scythe also makes a KFlex PWM, that may be a better option than the slipstream, but I'm not sure.

I think you need to test PWM to make sure, Bing mentioned that some fans have good PWM control while others don't and that seems to fit what I'm seeing to. The Coolermaster Blade master doesn't seem to turn down much at all with PWM compared to the Corsair H50 fan.

Need to do some PWM specific testing on this...I'm not sure at this point.
    
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post #260 of 476
Thread Starter 
FYI,
Here is a start on tabulating the results so far. I need to spend some more time reviewing videos to better dial in the subjective sound quality columns, but I figured this might be a good suppliment to the cfm/dba graph. I could do some easy data sorting and simple bar charts out of this too..

It basically just consists of range for CFM & dBA, then I pulled dbA off the charts at every 5CFM, followed by my subjective guess on noise quality.



Uploaded with ImageShack.us

Here is an example of the bar chart of the 20CFM mark:
This is only the low speed fans, high speed fans usually couldn't turn this low..
    
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