Can you run a fan splitter of a cpu fan port?

ExoMale · 13 Sep 2019 at 15:29

basically I’ve got a mini compaq slim computer I will be using a lot, it has the amd vision which in my case is an E450, it has this motherboard

h-aft1-udxt-1

From what I can tell it has no fan support other than the cpu header and because the power is built in and off an adapter it has no molex or 24 pin if I wanted to go pico, so I was wondering if I could use a fan splitter? I have one spare and have been trying to find an expansion slot blower given that be my own option for a fan ha.

I got this computer the other day for a proposed business start, so it’s enough for what I need and while it only has an ssd + hdd amongst the heatsink and mini fan it can get a bit warm, figured I could try improve it.

Steveocee · 13 Sep 2019 at 16:38

Running a splitter on the CPU fan is no problem at all. Have been running like that for years with my D15 running two 140mm fans.

ExoMale · 14 Sep 2019 at 16:56

Steveocee said:
Running a splitter on the CPU fan is no problem at all. Have been running like that for years with my D15 running two 140mm fans.

Okay cheers for reply, I did read it’s fine, but also not fine as the cpu fan header obviously controls the cooler speed etc, so could run every fan attached at max speeds meaning more noise etc, but I will give it a try, can’t see what the worse could be ha.

drakulton · 15 Sep 2019 at 19:23

ExoMale said:
Okay cheers for reply, I did read it’s fine, but also not fine as the cpu fan header obviously controls the cooler speed etc, so could run every fan attached at max speeds meaning more noise etc, but I will give it a try, can’t see what the worse could be ha.

You could always whack a ' low noise adaptor' on the non CPU fan/s to .....er keep the noise down.

ExoMale · 15 Sep 2019 at 20:46

drakulton said:
You could always whack a ' low noise adaptor' on the non CPU fan/s to .....er keep the noise down.

Ha thanks, noise isn’t an issue for me anyways, but I’ve ordered some 40mm fans to try out.

Steveocee · 16 Sep 2019 at 10:14

It's all relative though. Your case fans won't go full speed unless your CPU fan needs to go full speed. Ideally they would help regulate each other.

doyll · 16 Sep 2019 at 12:22

As suggested use a splitter. There are PWM splitter / hubs that us PSU for power and PWM control from motherboard fan header.

What is your component temp to fan speed curve setup? I usually set it so fans idle at about 500-700rpm and speed up as temps rise going to about 900rpm up to about 1100rpm at 65c, then full speed at about 75c. This keeps things quiet until components need more airflow.

You might find below link to how airflow works and how to optimize case airflow of interest.
https://forums.overclockers.co.uk/threads/help-with-fan-setup.18763212/#post-30354296

drakulton · 16 Sep 2019 at 15:56

The majority of boards kick out 1 amp at the headers, and most fans draw about 0.3 amps, so you should be good for three fans off the CPU header. It's always worth checking the mobo and fan specs to be sure.

doyll · 16 Sep 2019 at 17:18

Keep in mind most fans' load ratings are running load, not startup load / stall load, and stall load / startup load is 3-5 times more. This is why most of the fan header failures are when system is starting up. Owner pushes start button, system boots up and owner smells smoke .. maybe systen shuts down.

The above is good reason to use PWM fans and any time more than 2 or 3 are being ran use PSU powered splitter or hub.

Below link to Nidec-Servo Gentle Typhoon fans has chart showing running and startup loads.
http://www.e-jpc.com/pdf/gentle-typhoon-d0925-catalog-2.pdf