EP35C-DS3R Fan headers and sensors

[profJim]

Re: EP35C-DS3R Fan headers and sensors

You'll probably need to contact GB Tech Support directly with your query.
This is not an official GB tech site, but we do have some forum members with excellent people/source contacts.

Given the highly technical nature of the fan header specs, I think that creating a new thread with an appropriate tech title would be best.
Including such super tekky terms like "Ohms" might be enough to scare away some from the thread. ;)

[Kiriakos]

Re: EP35C-DS3R Fan headers and sensors

Including such super tekky terms like "Ohms" might be enough to scare away some from the thread. ;)

Thanks for the suggestion, and the positive spirit ..

[profJim]

Re: EP35C-DS3R Fan headers and sensors

No problem, let's not make a mountain out of a mole hill.
I can't wait to find out if I can safely run 10 amps worth of fans from EACH of my fan headers. (ooooh!!)

[Kiriakos]

Re: EP35C-DS3R Fan headers and sensors

10 amps from one header .... you should just wait a bit , for the Ultra durable motherboards Version 8

The " mole Hill" made me, like any non native English speaking person , to Google it ...







Today I will take my system apart , to add some 120mm side fans and filters.
And so I will photograph the transistors that powers those headers, and hopefully I will find from their codes , the electrical specs.

Even so, I must to admit that by operating my large fan with the PWM converter ( that adds some extra load in mA ) like in a total of all most 600 mA for 30-40 seconds full speed , with out to damage the motherboard header ...

Its an amazing proof that this motherboard , it does have something Durable in it ..

Most of the times those labels stands just as an marketing trick ( Just to boost sales ).

And I have see an significant number of motherboards of other brands, to get damaged , even with the half load, of the 600mA .

[profJim]

Re: EP35C-DS3R Fan headers and sensors

A quick check for Fan Controller on Newegg shows several multi-channel (3 - 6 channels) units that provide 10 - 30 watts per fan channel.

My Zalman ZM-MFC2 fan controller has 4 separate fan channels, displays fan speeds, has 4 accurate temperature probes, and displays total system wattage draw. The display is a bit hard to read. A better solution for about $50 - $60 might be one of the NZXT fan controllers. There are several fan controllers that support up to 6 fan channels. The controllers that don't have fancy LED panel displays cost less.

On my setup, I modified several fan Y-cables so that I can connect the yellow fan-speed sense wire for each fan channel to the motherboard fan header so that software can display the fan speeds.

My preference is for front panel fan controllers with manual adjustments.
Some controllers have a very limited adjustable voltage range. Check the specs before you buy.

[Kiriakos]

Re: EP35C-DS3R Fan headers and sensors

I did my small research about the power headers , and my discoveries are not much,
due the complex layout of the PCB , but still are important.

It looks that three of the four Fan Headers, they use as source the MOSFET 3310GH
that is an very powerful chip , extremely powerful to power not just fan , but the 1/4 of the motherboard it self .

That's why when I did use an power hungry fan 480mA on the CPU header,
the motherboard did not get damaged.

Usually , older motherboard designs, they had individual smaller MOSFET for its fan header , that was offering the 1/10 of the power that the MOSFET 3310GH can give . http://www.elektrofor.ru/pdf/tranzistory/AP3310GH.pdf

I did verify my story about the MOSFET 3310GH , finding an German message ,
that some one with P35-DS3R , managed some how to burn the MOSFET 3310GH,
and all the fans on the motherboard stopped working ...

The only Fan header that looks unclear from where it gets powered ,
are the SYS-Fan1 ( behind the NB Bridge ) .
This one could possibly get power from some line , that comes from the NB it self.
I speculate here , because I would had to remove the heat-sink so to find out,
and I did not liked to remove it just for that.


SYS FAN2 (PWM)

Well by having the Nanoxia PWM to DC controller , I had the chance to test this Fan header for good .

And by plugging the 4 pin connector at the default pin out , and also by rewiring the Nanoxia PWM-X connector, so to actually become an perfect match for the named Pins by the Gigabyte schematic on the manual.

And I like to verify , that the users manual schematic are totally wrong .

Both PWM headers like CPU-FAN and SYS FAN2 , are using the same pins out,
but the SYS FAN2 , limits the output to 5V, for 3PIN fans & PWM fans .

And actually , the PWM fan it will spin slower than the 3PIN fan, because the inner controller of the PWM fan , it will drop the actual motor voltage by 1 - 1,5V minimum , due the inner resistance of the circuitry.

Picture ..

[Kiriakos]

Re: EP35C-DS3R Fan headers and sensors

And so the easy choice for the SYS FAN2 ,are to used only to drive one small NB fan .

But its possible if you get 12V from an molex plug, and drive that voltage at the PWM fan or PWM to DC controller 12V cable ( directly ) with the rest pins connected normally at the header , to get back the full power , that the 5V takes away.

Last picture.