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I have the Arctic F12 and F8 PWM fans. They are installed in my DP55WB system as Rear and Front fan. In the bios they can be identified as front and rear fan aside from the processor fan. I also have IDU installed and originally these fans are labeled as Inlet fan 1 and 2 but I change it to Inlet and Outlet fan. Both fan are operating as expected. They are very silent.
Thank you for your response.
The DP55WG and DP55WB are largely similar, and specifically the hardware monitoring systems look to be identical.
Also the different Arctic F12 PWM fans are comparable. These fans are indeed very silent.
So, when comparing our systems, the only real difference of importance for this problem might be the BIOS.
Do you also have four fan speeds listed, and which BIOS setting do you use?
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In my bios under Real-Time Hardware monitoring the fan speed are listed as: Processor Fan Speed, Front Fan Speed, and Rear Fan Speed. There is no auxiliary fan speed unlike in your bios.
The following are my settings:
CPU Fan Control = Enable
System Fan Control = Enable
Lowest Fan Speed = Low
OK, thanks again Boyet.
I am using the same bios settings (and also tried all other settings). I am using only one extra fan apart from the CPU fan (no front fan), but I am pretty sure that this can (at least should) not be the cause of this problem.
It looks like a fault in the bios probably is causing this problem. It would be great if someone with a DP55WG and a PWM fan could confirm this.
Hopefully the next bios update for the DP55WG will solve this.
As an update to this problem: it appeared that today a new BIOS update was released for the DP55WG: version 4752.
Although the release notes did not mention anything that comes close to the problem in question, I inmediately installed this new BIOS.
However, unfortunately this new BIOS does not solve the problem.
So, assuming that the problem is caused by a flaw in the BIOS, I hope that a next update will solve it.
It appeared to be a problem with the Arctic F12 Pro PWM fan anyhow. Apparently I did misunderstand how to connect this fan to the desktop board.
There are three connectors attached to the fan:
A) a normal 4-pin PWM plug with 4 wires
B) a 4-pin PWM socket with 4 wires (running from plug A)
C) a 3-pin power plug with 1 wire
Originally I only connected plug A) to the Rear fan header, and that didn't work (the fan speed was controlled, but the speed was not shown in the BIOS and IDU).
To solve this it appeared that I also had to connect the plug C) to socket B).
The plug C) apparently gives the tacho signal that can be used to measure the fan speed, and this signal is now transfered via socket B) to plug A) and to the desktop board.
Glad to hear your problem is now resolved and even more glad to hear that it was not us that had a failure.
Remember all, on DP55KG, DP55SB, and on DP55WG be sure to set the 3 or 4 wire fan question properly. A 3 wire fan is not PWM but a 4 wire fan is. We have 4 wire fan headers on all headers with the intention of customers plugging in either 3 or 4 wire, but then making sure BIOS Setup is set to the proper setting. 3 Wire fan for 3 Wire fans. 4 wire fan for 4 wire fans.
Yes, I now followed the "If there is an extra 4-pin PWM socket on the mainboard" connection scheme from Arctic installation leaflet.
This Arctic installation leaflet is not very clear, and at first I assumed that it would be logic to only connect the 4-pin PWM plug with the four wires. But apparently only three of these wires are used in that case (not the wire for the tacho signal).
Anyway, thanks again for your help.
To Edwin Tracy,
Edwin, assuming that you are an Intel employee, I would like to point your attention to two problems with the fan control that also have been mentioned in this discussion and that still exist.
The first problem is that when in the BIOS the System fan control is set as ENABLED and the minimum speed is set as OFF the fans run always at full speed
As I understand it the idea is that the fans with this OFF setting should stop completely when there is no demand for extra cooling, in stead of always at least running at a slow speed with the SLOW setting. Is this the correct understanding?
The second problem is that in the DP55WG BIOS (including the newest version 4752) a fan speed for an AUX fan is shown, but this fan connection does not exist for the DP55WG.