Phanteks PH-F140TS help

Chrisoldinho

Chrisoldinho

Chrisoldinho

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I purchased an additional Phanteks PH-F140TS fan to compliment my Phanteks- PH-TC14PE CPU cooler.

The 2 supplied fans with the Phanteks- PH-TC14PE cooler came with a splitter cable, and importantly a PWM converter cable, plugged into the CPU header on my motherboard this works flawlessly.

However the Phanteks PH-F140TS additional fan I got did not come with the PWM adapter, meaning it ran at a constant 1100rpm.

I was able to get hold of an additional PWM converter cable via Phanteks and their great customer service, however despite fitting this into the CPU_OPT header, the fan continues to spin at 1100rpm, I have tried a variety of profiles in the BIOS and using the ASUS AI SUITE but the changes made are minimal, at the most if I set the profile to a custom setting and put it on the minimum spin rate, it still spins at 1050rpm, only 50 lower than standard.

Any suggestions on what I can try, other than disconnecting it and removing, because that will be the end result if there is no fix.

Thanks,
Chris.
 
You'd expect the CPU OPT to be matching PWM of the main header. I wonder if the load on the PWM converter isn't high enough to see the benefits of speed retardation.

In my experiements I found that some of the main B772 transistors amplified better than others and the resistor network to slow them down to the same level was quite different, sometimes I needed 2k to get the same result as one that was fine with 1k. As all Phanteks PWM converters are fitted with a 1k ohm main resistor it is quite possible that this coupled with a high amplifying B772 will give only minimal speed reduction. It was this limitation that prompted me to design the switch and then the potentiometer into my PWM converter design.

One possible solution would be to swap with your other PWM converter and hope that it reduces the speed a bit better on 1 fan. Or you could add another fan to it, say a top or rear mounted PWM fan.

Of course this is assuming that the OPT header is putting out PWM. Easy to check this. Swap the 2 fans over to the OPT header and see if the speed is reduced normally.
 
Thank you doyll and Tealc.

I have attempted to connect the single fan directly to the CPU header on it's own with the other fans disconnected. This made a very minor difference (50 rpm).

I then switched the PWM converters around, again, this made a minor difference, but nothing substantial, currently the single fan is running at 1074rpm (connected to CPU / CPU_OPT), it's rated at 1200+10% so clearly it is responding to PWM but not enough.

Even the dual fans are running at 979rpm in silent mode, no strain on the CPU, I would have thought this would be much lower.

I do have have a dual 4 pin to single 4 pin splitter in the loft, is it safe to run 3 fans into a single CPU header?
 
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One header can handle 1Amp. The fans should specify their current rating on the back. Connecting three fans to one PWM converter might cause the transistor to warm up a fair bit so you might want to monitor it, especially as low duty cycles.

Strange why you get such fast speeds though. Might be a PWM output issue I suppose.
 
I found the Phanteks PWM adapter really wasn't all that good. Fans didn't run full speed, adapter got hot at low speed, run 2 fans on splitter and fans ran even slower..

I put real PWM fans on instead.. But that was before Tealc had his PWM adapter figured out. I haven't used his but belief it is a good design and does what it says on the tin.. guess it's really heatshrink. :D
 
I guess the Phanteks design is only as good as the components they use. Both transistors are cheap and have wide ranges of amplification.

I put together and use a better solution with a Mosfet and a potentiometer to dial in the exact range of speeds you want, in a way its even better than a true PWM fan as they sometimes react to the pulse and make a noise at lower speed. I've made several of these things for myself and other forum members and they seem to get good feedback.

I've got one in my drawer here that'll run all three fans off the one header, and with a slight modification could run 6 or 7, depending on fan currents.

http://forums.overclockers.co.uk/showthread.php?t=18421145

P1050496.jpg
 
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Tealc said:
I guess the Phanteks design is only as good as the components they use. Both transistors are cheap and have wide ranges of amplification.

I put together and use a better solution with a Mosfet and a potentiometer to dial in the exact range of speeds you want, in a way its even better than a true PWM fan as they sometimes react to the pulse and make a noise at lower speed. I've made several of these things for myself and other forum members and they seem to get good feedback.

I've got one in my drawer here that'll run all three fans off the one header, and with a slight modification could run 6 or 7, depending on fan currents.

http://forums.overclockers.co.uk/showthread.php?t=18421145

P1050496.jpg
Click to expand...

WOW is all I can say, I very much like the idea of this.

Don't suppose I could be cheeky and ask if you would be able to make one for me, and how much £ you want?
3 fan solution is perfectly adequate for my needs, 4 would be the nuts but not a necessity, also concerned if this could all be powered via one header as every fan is 140mm.
 
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If you are concerned I can always modify it and have a Molex on there for power. However the fans are only rated at 0.15A each so actually use less than half of the allowed current on a motherboard header. In addition the circuit design is such that even at start up, where traditionally a fan will draw more current, the current inrush is limited by the circuit thereby protecting against current overload.

Drop me a message in trust please :)
 
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Tealc said:
If you are concerned I can always modify it and have a Molex on there for power. However the fans are only rated at 0.15A each so actually use less than half of the allowed current on a motherboard header. In addition the circuit design is such that even at start up, where traditionally a fan will draw more current, the current inrush is limited by the circuit thereby protecting against current overload.

Drop me a message in trust please :)
Click to expand...

OK.
 
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