Case Fans, Need Connection Terminals Explained

[2therock]

I have a Gigabyte GA-EP45-UD3P motherboard and currently running a heat sink fan cooler on the CPU terminal and have my two case fans, one on Sys_Fan-1 & the other on the PWR_Fan simply because they match my 3-pin fan connectors.

I am curious about the Power Fan terminal and the voltage pin out differences between Sysfan 1 & 2.

There is no manual or Google-up plain explanation.

I just don't know why I would choose one or the other. When would the Sys_Fan2 come into play.

The fans I have are Yate Loon 120mm medium speed units.

My board pin outs below

[VorLonUK]

Re: Case Fans, Need Connection Terminals Explained

Both are PWM type, yet the CPU one allows for Full PWM control or a Full fixed 12vdc on pin 2, allowing standard 3 pin fans to be also connected.

So basically the CPU one will cater for both scenarios.

The second one is a bit odd and the VCC seems to be around 8 volts on my board, but it will vary slightly. I haven't confirmed if it varies with Heat, say from the Northbridge etc.
So if you connect a 12vdc standard 3 pin fan to it, that has a good lowish start voltage, it'll run at around 2/3 of normal speed.
The same should be for a PWM fan too, as the Speed pin (4) is at 5 volts, which is the max "pullup" for the speed pin on a PWM fan. So the speed pin should be saying "go flat out", but the Supply volts (VCC) will be making it work like a standard 3 pin fan.

The latter you mention is the standard 3 pin fan, which consists of a Ground Pin, VCC 12volts and a tacho feedback pin (for speed sensing etc)

[Lsdmeasap]

Re: Case Fans, Need Connection Terminals Explained

It would all depend really on how you wanted them to run as said above

[2therock]

Re: Case Fans, Need Connection Terminals Explained

Thanks, and sorry for the lag time getting back.

I have several Yate Loon 3-wire medium and low speed fans on my bench and one high speed unit.

I have a HS/Fan on the CPU terminals.

I want no more fan than needed with a possible board controlled speed-up when needed. I just want to try and get away with no more add-ons to get what I want like after market controlers.

I tried Speed fan but it does not want to fully cooperate so I have a problem with trusting it. The Gigabyte software is pathetic also. Clunky and vague.

I would love to try anything you guys come up with. Are there any BIOS versions out there that address the fan thing specifically? I am still running the F4 and am very stable.

[Lsdmeasap]

Re: Case Fans, Need Connection Terminals Explained

I have not seen any Fan related talks in any BIOS discussions.

You may want to just give in a buy a nice fan controller? Your mind will thank you, here is what I use but of course you have MANY options that cost more or less >>

Newegg.com - ZALMAN ZM-MFC1 Fan Controller Panel - Controller Panels