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[Official] Gentle Typhoon 2150 Group Buy Thread - Page 222

post #2211 of 2446
Have a look here:
http://martinsliquidlab.org/2011/04/03/sunbeam-rheosmart-3/
Martin advises to keep that controller under 5 watts per channel ....... when the claimed specs are at 30 watts per channel.
I was considering the Sunbeam until I read Martin's review and that's when I had a flash-back to my smoking rig.
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post #2212 of 2446
Quote:
Originally Posted by PepeLapiu View Post

Here is the thing with resistive controllers: let's say your fan uses 12 V at full speed. Let's say you want to slow it down to half with a resistive/undervolting controllers: the controller will still use up the full 12 V from the PSU. It just burns half of it, turns it into heat inside your case. And sends the rest to the fan.
So, the slower you want your fans, the more volts those controllers will turn into heat inside your case
And that Aquaero is just too funny: a waterblock on something that is supposed to help you cool your rig? Ha! No thanx for me!
I've had a few resistive/undervolting fan controllers and now that I got the Touch, I would never go back to those weak-ass heat producers.
I've ended up burning virtually every fan controller I've touched. Have you ever seen smoke coming out of your rig when you try to slow down too many fans too slow? I have, not a good feeling to look at a smoking case.
But this one produces no heat at all, it controls my fans via a PWM technique which uses only the power it needs without turning anything to heat. I hear the NZXT line is not bad either and they do look real good ......... no resistive/undervolting/heat-score there either.

That's all nice, but the GTs are not PWM capable, meaning the only way you can control them is with voltage reduction.

Also it's not the poor fan controller's fault that you overloaded them smile.gif
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post #2213 of 2446

Actually, some fan controllers control Voltage-controlled fans by sending them intermittent doses of 12v on their 12v lines. It's these mainline PWM controllers that I like to stay away from: they can cause some fans to make noises. At least that's what I thought I heard.

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post #2214 of 2446
Quote:
Originally Posted by Aximous View Post

That's all nice, but the GTs are not PWM capable, meaning the only way you can control them is with voltage reduction.

PMW fans have 4 wires, and can be plugged into mobo headers. They are true PWM fans.
The Lamptron controllers are sort of a simulated PWM in that it acts as a switch that is being flikked very fast.

And ehume, what do you mean by "mainline"?
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post #2215 of 2446
Quote:
Originally Posted by PepeLapiu View Post

Have a look here:
http://martinsliquidlab.org/2011/04/03/sunbeam-rheosmart-3/
Martin advises to keep that controller under 5 watts per channel ....... when the claimed specs are at 30 watts per channel.
I was considering the Sunbeam until I read Martin's review and that's when I had a flash-back to my smoking rig.
That may only apply for that certain test controller or even just that model. I've run up to 20W (4 Yate Loon Highs) on a channel on my Rheosmart 6 and it works fine without getting too hot.

Quote:
Originally Posted by Aximous View Post

That's all nice, but the GTs are not PWM capable, meaning the only way you can control them is with voltage reduction.
Also it's not the poor fan controller's fault that you overloaded them smile.gif
I think he means the controller itself controls the voltage being pumped into the fans via a PWM method for the controller itself, not for the fans. This way, the channels don't output the excess heat generated by the unused voltage when slowing the fans down.
    
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post #2216 of 2446
Quote:
Originally Posted by Kokin View Post

That may only apply for that certain test controller or even just that model. I've run up to 20W (4 Yate Loon Highs) on a channel on my Rheosmart 6 and it works fine without getting too hot.
At what setting did you keep your fans? Were they slowed down to the slowest speed possible, or near the lowest setting on the controller?
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post #2217 of 2446
Quote:
Originally Posted by PepeLapiu View Post

At what setting did you keep your fans? Were they slowed down to the slowest speed possible, or near the lowest setting on the controller?

I varied depending on my load. I think the lowest speed I put all 4 fan was at about 800-1000RPM, which was when they became silent (at least to my ears). I had the 4 connected together for a few weeks if I recall correctly. I think they can go down to about 400-500RPM before dying, so I definitely wasn't reaching the lowest setting.
    
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post #2218 of 2446
Quote:
Originally Posted by PepeLapiu View Post
Have a look here:
http://martinsliquidlab.org/2011/04/03/sunbeam-rheosmart-3/
Martin advises to keep that controller under 5 watts per channel ....... when the claimed specs are at 30 watts per channel.
I was considering the Sunbeam until I read Martin's review and that's when I had a flash-back to my smoking rig.

The 5 watts per channel isn't necessarily due to the heat output, but because the PWM feature fails to work at the lower voltages. This definitely seems to be the case with my Rheosmart 6. I have 1.05A on channel 2 (3 KM2 1700), and the fans don't start up at the same RPM as manual control. But channel 1 (0.35A) starts up at about the same RPM as manual.

 

I haven't had any issues with the heat produced, even at the lowest speed possible since I have a 900RPM 120mm fan exhausting it at all times.

 

Do you know if the Aquaero has trouble with the lower voltages when there is a large load (e.g. 20W)? Assuming it is adequately cooled of course.

 

 

 

I forgot to ask: Do the GT-2150's have any resonance issues like the GT-1850's?

post #2219 of 2446
Quote:
Originally Posted by PepeLapiu View Post

Quote:
Originally Posted by Aximous View Post

That's all nice, but the GTs are not PWM capable, meaning the only way you can control them is with voltage reduction.

PMW fans have 4 wires, and can be plugged into mobo headers. They are true PWM fans.
The Lamptron controllers are sort of a simulated PWM in that it acts as a switch that is being flikked very fast.

And ehume, what do you mean by "mainline"?


12v being pulsed so that the fan is starved for current, runs more slowly. I once ordered a PWM controller kit. When I realized it controlled by pulsing the 12v line, I gave it away instead of assembling it. PWM control as designed for computer use pulses the special 5v line, which causes the fan's PCB to control the speed. The 5v line is not the main power line for the fan. The fan motor and fan PCB get their power from the main 12v line.

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post #2220 of 2446
Quote:
Originally Posted by ehume View Post


12v being pulsed so that the fan is starved for current, runs more slowly. I once ordered a PWM controller kit. When I realized it controlled by pulsing the 12v line, I gave it away instead of assembling it. PWM control as designed for computer use pulses the special 5v line, which causes the fan's PCB to control the speed. The 5v line is not the main power line for the fan. The fan motor and fan PCB get their power from the main 12v line.

I dont get why you seem to think that's a bad thing.

And I'm not sure about slower, the Lamptron Touch gets my GT-2150's spinning between 2100 and 2200 rpm at max .......according to the tach wire anyway. I don't know how accurate that wire is.
Edited by PepeLapiu - 5/8/12 at 7:09pm
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