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Driftwood
13-10-2019, 01:13 PM
With sumer approaching I have decided to add a 4th cooling fan to my gaming system.
Currently running three PWM 120mm fans from headers on mobo.
I'm upgrading the graphics card so would like to add a 140mm top exhaust
My mobo only has 3 headers, but the graphics card has 2 more.
Question:
If I connect 1 or more of them to the graphics card will they get along happily ??

dugimodo
13-10-2019, 02:58 PM
Dunno about that, but you can get a y splitter cable to run 2 fans off one header. Usually only one has the speed sensing wire attached so the controller doesn't get confused and both fans run at the same speed.

https://www.pbtech.co.nz/product/CABSTT1822410/StarTech-FAN4SPLIT12-12-4Pin-PWM-Fan-Extension-Pow
https://www.pbtech.co.nz/product/SEVOEM9576/OEM-4-Pin-PWM-To-2-x-4-Pin--3-Pin-Cable-Y-Splitter

if you get one with all 4 wires on both fans you might have to cut one wire to speed control them.

Lawrence
13-10-2019, 04:45 PM
If you are running generic fans perhaps upgrading to either Noctua,Purewings 2 or similar would do the job of moving more air

Also the added bonus of lower noise

Driftwood
14-10-2019, 10:12 AM
I was aware of the Y splitters but didn't really want to go that way, when there is another option.
I just thought someone on here may have done this & could advise.
I was thinking 1 intake & 1 exhaust from the GPU & the same from the mobo.
I am quite happy with the Akasa Viper fans I have, they are almost silent on idle but wind up when the load goes on.
Was hoping adding a 140mm top exhaust would take some of the load & the end result a quieter running system.

dugimodo
14-10-2019, 10:49 AM
My case has 2 fan positions front and top and one at the rear. As it happens I found a video online testing how different fan setups affect temperatures that used my exact case (cooler master master air range, forget the model offhand) which showed adding a top extractor fan to the supplied two front and one rear configuration reduced system temps by about 2 degrees and adding a second top fan made no further improvement. Hardly amazing gains, but I had a spare fan around so I added one to the top anyway.

As to your original question I've never had a graphics card with external fan headers but I see no reason they wouldn't work. Presumably the driver software has a fan control section in it. What might happen though is you'll get different fan speeds compared to the motherboard controlled fans.

My motherboard has a lot of fan headers though so they all have there own. One thinks it's a water pump but that's ok.

Driftwood
14-10-2019, 12:44 PM
My case is a Silverstone Redline RL01-USB.
Actually has provision for 5 fans, so I can experiment somewhat.
First thing I did when I got it was take out the drive caddy which totally blocked off any air from the front intake fan.

dugimodo
14-10-2019, 02:09 PM
I've had online arguments about cooling on toms hardware, was told to stop giving bad advice when I suggested one extractor fan is actually enough in most situations. But I stand by that comment.

If you move more air in than out you can filter the intakes and reduce dust build up. I recommend a positive pressure setup like that unless you like cleaning out dust regularly, but negative pressure often cools slightly better depending on case design.

But regardless, however much air is going in to the case has to come out again, and however much is going out has to also come in. So you can get away with only intakes or only outlet fans. What adding the extra fans does is control where the air comes in from or is taken out from. Mine has 2 in and 2 out so is relatively balanced, but you can never be perfect. Adding a top extracor will prevent build up of heat int he top of the case, but if it's well vented on top it'll come out on it's own anyway - especially if you have positive pressure going on.

Driftwood
14-10-2019, 04:05 PM
I would agree with that.
When I first built this system running a GTX970 it had only 2 case fans, one in & one out.
Worked great, let the bios control the fans.
Was almost silent at idle.
After upgrading to GTX1080 the fans were noisier under load.
Adding a third quietened it down again.
Didn't seem to make much difference if it was at front or on top.
Although on top at idle it would shut down.
So I'm thinking 140 on top, 2 120's at front & the rear 120.
The top will be stopped at idle.
The 2 at front will creat positive a pressure although I could have one of them shut down at idle too.

apsattv
17-10-2019, 02:06 PM
A lot of talk about fans, but not one metion about what temps you have?

Driftwood
17-10-2019, 03:26 PM
Is that important ?

wainuitech
17-10-2019, 04:32 PM
If you need more connections than the Board has you can also use a Molex to 3 Pin / 4 Pin connector. The PSU will have them and these days they are only spares ( unless its a Modular and doesn't have them plugged in)

https://www.pbtech.co.nz/product/SEVOEM9465/OEM-1-x-Molex-D-Type-4-Pin-Male-To-1-x-Fan-3-Pin

chiefnz
21-10-2019, 07:25 PM
With sumer approaching I have decided to add a 4th cooling fan to my gaming system.
Currently running three PWM 120mm fans from headers on mobo.
I'm upgrading the graphics card so would like to add a 140mm top exhaust
My mobo only has 3 headers, but the graphics card has 2 more.
Question:
If I connect 1 or more of them to the graphics card will they get along happily ??

That should be fine, the fan speed will be controlled by the GPU's sensor so will only likely ramp up when you are gaming and the GPU is heating up. What is the make and model of the GPU you're upgrading to? You should be able to use something like MSI Afterburner or EVGA's Precision X1 tool to setup the fan curve accordingly.

Cheers,

Driftwood
22-10-2019, 01:05 PM
This has worked out ok & the system runs very quiet.
There was no issue with temperatures, this was only about noise.
I finished up with a 140mm lower front intake & 120mm rear exhaust connected to mobo.
This should maintain a positive internal pressure.
The other 120mm upper front & 120mm top rear exhaust are connected to GPU.
The GPU has it's own software to control the fans.
On the default setting they dont come on until the GPU reaches 60 degrees.

Driftwood
02-11-2019, 12:24 PM
Good chance to check out this cooling today.
They are forcasting 29 degrees this arvo.

chiefnz
02-11-2019, 02:17 PM
27deg here in Sydney

GPU AND CPU are bouncing between 30 - 33 deg :punk:punk:punk

Driftwood
02-11-2019, 02:31 PM
Got 28.3 outside 22.9 inside.
System at medium load, cpu 62 & gpu 53.
Still not enough to start second set of fans.

You still getting smoked out over there ??