yavuzs
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Hello guys, I am just wondering that any of the fan headers on the pcb (gpu,mem etc. We have 3 of em on the card) can handle one additional 1500rpm fan to the side panel window( It means an additional 0.4A current). I am gonna connect it via mini pwm splitter cable if it is possible. Thanks for your replies.
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AHowes
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Re: 1080 ti ftw3 - power draw of pwm fan header
2017/12/05 05:57:19
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Wouldnt it be easier to just connect a fan to a Molex connector or motherboard fan header? Space is tight from with the heatsink in the way.
Figuring when you need to remove the side panel it would yank on the cord from the fan.
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robobzzoy
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Re: 1080 ti ftw3 - power draw of pwm fan header
2017/12/05 06:47:26
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I am running two be quiet! Silent Wings 3 high speed fans off 1 of the header for my hybrid radiator, so it should have enough power. One thing about the splitter, I tried using a splitter directly off the header (mini-GPU to 2x 4pin PWM), and the software wasn't reading them quite properly. At 50% in Precision, the fans were running at max RPM. Not sure why. I switched to a mini-GPU to 4pin, then a splitter off that and it's a little better. AHowes idea is a lot easier.
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yavuzs
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Re: 1080 ti ftw3 - power draw of pwm fan header
2017/12/05 08:53:13
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Thank you guys for your answers. They are helpful enough. I wanna do that because all mobo headers controlled by cpu or system temperatures. I want the additional side fan to be controlled by gpu temp sync with gpu fans. And robobzzoy, i am gonna split it directly from the mini gpu into two. Then connect the first cable (with reader pin) to stock fan itself on gpu and additional fan to the second one(w/o reader pin) with a mini-gpu to 4 pin. So it should work that way and i dont care about the rpm reading of side panel. I believe Precision wont understand anything (just little more current) and keep reading the old parameters😊. Btw, thanks again for your help.
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HeavyHemi
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Re: 1080 ti ftw3 - power draw of pwm fan header
2017/12/05 10:21:07
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Fan headers are generally rated for a maximum of 1 amp. That includes starting current. If you're claiming each fan draws .4 amp, 3 of them would exceed the max rating of the fan header.
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Sajin
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Re: 1080 ti ftw3 - power draw of pwm fan header
2017/12/05 12:14:28
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HeavyHemi
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Re: 1080 ti ftw3 - power draw of pwm fan header
2017/12/05 12:50:15
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Sajin "Power limitation of the fan connector found on modern graphics cards is limited to 2 amperes!" - https://www.ekwb.com/shop/ek-cable-pwm-fan-adapter-for-gpu-50cm Looks like fan headers on modern gpu's is 2 amps per header.
I'd have to see something official on that before I recommend doubling the current draw from the fan controller. Nvidia and AIB makers when asked say 1 amp. The same as they are commonly rated on motherboards. Edit...yes...I thought I remember prior confusion on this... https://forums.evga.com/4...-Support-m2710100.aspx
post edited by HeavyHemi - 2017/12/05 13:55:07
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yavuzs
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Re: 1080 ti ftw3 - power draw of pwm fan header
2017/12/14 23:41:35
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Those were very helpful guys. I found the cables and I will share the results as soon as I give the try.
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madr1c
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Re: 1080 ti ftw3 - power draw of pwm fan header
2017/12/16 16:02:12
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I also tried to do a similar project with my old Gigabyte GeForce GTX 980 Ti Gaming G1. To power three of my Noctua NF-A14 PWM case fans I tried to tie them to the PWM signal of the GPU. On moddiy.com I could find the necessary cables but besides being quite expensive it had some other drawbacks as well. I ended up with two additional fans running of the GPU because each fan header had just enough power to support one Noctua fan next to the actual GPU fan. Another problem was that the Noctua fans need way more power to run than the GPU fans but one fan header can only handle one PWM signal. So if I pass though the GPU fan signal the Noctua fans will only start if the GPU fans run at near 80%. But if I pass though the signal of the Noctua fans the GPU fans are running really loud. I solved the second problem by using the PWM signal of the Noctua fans and putting a small resistor between the Y cable and the GPU fan. But I had to play around a lot to find the right resistor.
All in all I'd say it's not worth the hassle but the idea of tieing the PWM signal of the GPU to some case fans is pretty logical since GPU is often the most power hungry component in a PC.
I've seen full size PWM fan headers on the ASUS Strix cards and on the new Vega 64 Nitro+ from Sapphire. That is actually a really good idea and seems to work pretty well on my new Asus GeForce GTX 1080 Ti ROG Strix OC.
I'd like to see that on EVGA cards in the future. Then I'd definitely switch back to EVGA for my next GPU because I like the build quality of their cards best.
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ty_ger07
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Re: 1080 ti ftw3 - power draw of pwm fan header
2017/12/16 20:17:37
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So if I pass though the GPU fan signal the Noctua fans will only start if the GPU fans run at near 80%. But if I pass though the signal of the Noctua fans the GPU fans are running really loud. I solved the second problem by using the PWM signal of the Noctua fans and putting a small resistor between the Y cable and the GPU fan. But I had to play around a lot to find the right resistor.
That's not right and makes no sense for a PWM fan. 80% is 80% duty cycle and doesn't create any extra load on the PWM wire. It is a high impedance circuit. All load is absorbed by the power and ground wire which you might as well supply from the power supply directly. There is no reason why the fan header needs to absorb even a watt. Please provide your schematic. The difference in load/speed/behavior between the two fans and using a resistor makes no sense at all. If wired correctly, at 80%, both fans would spin at 80% of their max speed; and 30%, both fans would spin at 30% of their max speed. I have 5 Delta fans connected to/controlled by one motherboard fan header. Normally, that would nuke a fan header. You just need to wire it correctly so that all used power comes straight from the power supply and wire the PWM and tach feedback wire correctly so that it functions properly. Sometimes the lego pieces aren't designed properly for the situation and you need to make some changes. But a resistor? That doesn't sound right.
post edited by ty_ger07 - 2017/12/16 20:42:14
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yavuzs
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Re: 1080 ti ftw3 - power draw of pwm fan header
2017/12/17 02:09:43
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You are right. Theoretically there should not be any need for a resistor in pwm system. Usually pwm splitters has reader pin in only one of its headers so you can only monitor one of the fan’s speed that yopu connected. But pwm signal cable is mutual and they should be spinning at the same duty rate. (Speeds of them may vary if they are not exactly the same fans)
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madr1c
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Re: 1080 ti ftw3 - power draw of pwm fan header
2017/12/17 06:43:04
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I'm not an electrical wiring expert, but I've tried to translate the wiring I see into a comprehensible schematic. Could it be that the Y cable causes the problems? It splits the 12V wire, the grounding and the tacho but routes the PWM cable to only one of the fans.
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ty_ger07
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Re: 1080 ti ftw3 - power draw of pwm fan header
2017/12/17 07:38:49
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Huh? That's not correct. The PWM control wire needs to connect to both fans. The tachometer feedback wire should only connect to one fan. This is how it should look: And with the power coming straight from the power supply in order to not overload the fan header:
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madr1c
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Re: 1080 ti ftw3 - power draw of pwm fan header
2017/12/17 08:39:22
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Okay I reconnected the wires of the Y cable the way you described it and that seems to have solved the problems.
And to come back to the original topic of this thread. According to Noctua an NF-A14 fan pulls 0.13 amps at max. Now even a single fan header of the GPU seems to be able to handle all three of my Noctua NF-A14 fans next to the normal GPU fan without an external power source.
Thanks for your helpful comments. I am impressed by how quickly this community responds.
Nevertheless I want to leave an idea for a potential improvement for future EVGA graphics cards. As I already said in my first post here I'd really like to see a dedicated PWM header for external fans on the PCB of EVGA cards. They would be much easier to reach and it will eliminate the need for mini PWM adapters. It bothers me a bit when I have to take of the entire heatsink just to be able to properly reach a fan header.
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yavuzs
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Re: 1080 ti ftw3 - power draw of pwm fan header
2017/12/17 23:54:45
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Thats right. But even in actual situation, if we connect the additional fan to the y header (without tacho pin) it should be fine with one additional pwm fan. We only wont be able to read the rpm of it. But if you wanna connect more, we should supply the power from psu. I could not try it yet but gonna share the result.
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quadlatte
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quadlatte
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Re: 1080 ti ftw3 - power draw of pwm fan header
2017/12/18 09:10:51
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madr1c Okay I reconnected the wires of the Y cable the way you described it and that seems to have solved the problems.
And to come back to the original topic of this thread. According to Noctua an NF-A14 fan pulls 0.13 amps at max. Now even a single fan header of the GPU seems to be able to handle all three of my Noctua NF-A14 fans next to the normal GPU fan without an external power source.
Thanks for your helpful comments. I am impressed by how quickly this community responds.
Nevertheless I want to leave an idea for a potential improvement for future EVGA graphics cards. As I already said in my first post here I'd really like to see a dedicated PWM header for external fans on the PCB of EVGA cards. They would be much easier to reach and it will eliminate the need for mini PWM adapters. It bothers me a bit when I have to take of the entire heatsink just to be able to properly reach a fan header.
+1, a header or two on the back end for water cooling would be awesome, would allow for true controll of the cooling for that rad.
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