Controlling fans on CPU/GPU temps

Bryan Kortez · 19 Feb 2015 at 12:53

Is there anyway to get 1 set of 4 fans to speed up/slow down depending on if the GPU or CPU temp is increasing?

These fans are on a radiator that cools both the CPU and GPU. So I can't just plug them into the CPU header as if I use GPU processing and not much CPU, the fans won't speed up to cool the GPU.

My motherboard is an Asus Maximus VII Impact.

Bryan Kortez · 19 Feb 2015 at 13:00

Yeah, it's a custom loop using a D5 Vario pump.

I was thinking that, but I thought it would only change the speeds based on the CPU temp so the GPU's would overheat?

Bryan Kortez · 19 Feb 2015 at 13:34

If I use a chassis connect them, what sensor do they use for getting the temperature reading?

Bryan Kortez · 19 Feb 2015 at 17:10

I've got the same problem if I just connect an adapter to my gpu.. If I do that configuration, then my fan speeds won't speed up if only my cpu is in use..

Not sure if I'm just overthinking this, or just being stupid

How do most people control fans on a full system loop?

Bryan Kortez · 19 Feb 2015 at 18:25

Confused Stu said:
Provided you are happy with all the fans running at the same speed (rather than being individually controlled), the NZXT Grid+ could be an option:
http://www.overclockers.co.uk/showproduct.php?prodid=FG-027-NX

I'm currently using one to control the speeds of my RV03's intake fans based on GPU temperature. Does need a spare USB2 header on your motherboard to control it.

This looks like it could do the trick, as long as you can set it to monitor both CPU/GPU temps at the same time.

Bryan Kortez · 19 Feb 2015 at 18:53

Tealc said:
You could use a microcontroller to read the duty cycle of both CPU and GPU PWM outputs and have it output a single signal based on the larger of the two. That would be the diy way.

I'm not sure if there's a commercial solution to the problem.

I guess the only other option I have to to buy a fan controller that allows temperature sensor inputs. Input the coolant temp, and set a fan curve from that.

Bryan Kortez · 19 Feb 2015 at 20:26

doyll said:
Aquaero 5 for £56.99
http://www.overclockers.co.uk/showproduct.php?prodid=WC-011-AQ

Not cheap, but ....

I did some googling on that the other day, but couldn't find anything to say it would do as I needed.. I guess I could give it a try and see what happens.

Bryan Kortez · 19 Feb 2015 at 22:11

Been having a look at speed fan over the last day or two. I'm sure if I figured out how to work it using some youtube videos it might help a bit.

The Aquaero 5 does look good. It's got some nice features by the looks of it, I like the idea it can shut down your PC if something goes wrong. That may have to be the way forward, just input a water sensor temp and use that as my temperature to monitor. I can't think of any bad reason just having the fan curve set to water temp.

Also, looks like a good way to power my LED lights