Question My CPU cooler in the AIO fan slot won't go below 85% of max RPM ?

[Notatallsvelte]

Hi, thanks for reading. I have a Spirit 120 Evo Cooler,
Both of its fans are connected together into the AIO slot on my s PRIME B760-PLUS mobo.
I have an exhaust fan that's stuck at 100% in the adjacent CPU slot, I am going to replace it with a 4-pin fan, not that that is necessarily part of the problem?

The Evo is 4-pin though. I have gone through a lot of bios settings and used q fan tuning after trying different stuff each time, yet it never goes below 1720 RPM even though the CPU is only at 25C!
When I stress test it, the maximum appears to be just over 2k RPM.

Any ideas on how to reduce the minimum level? Thanks.

 

[geofelt]

An aio pump should be running at 100%. Possibly that can't be changed.
Read your motherboard manual.

 

[bill001g]

Can you manually set the fan speed. IE if you set it to say 50% does the fan run slower. If you can manually change the speed then the fan and motherboard connection are fine it is something related to the software and temperature curve. I like free software called fancontrol so I have not played with much else lately.

 

[dwd999]

Hi, thanks for reading. I have a spirit 120 evo cooler, both of its fans are connected together into the AIO slot on my s PRIME B760-PLUS mobo. I have an exhaust fan thats stuck at 100% in the adjacent cpu slot, am going to replace it with a 4 pin fan, not that that is probably part of the problem?

The evo is 4 pin though, I have gone through a lot of bios settings and used q fan tuning after trying different stuff each time. Yet it never goes below 1720 RPM even though the cpu is at 25C! When I stress test it, the maximum appears to be just over 2k RPM.

Any ideas on how to reduce the minimum level? Thanks.

The EVO cooler's fan closest to the back of the case should be connected to the CPU_FAN connection on your motherboard. Its 2nd fan can be connected to the AIO_PUMP connection since your motherboard does not have a CPU_OPT connection. Both connections must be set for PWM and have the same fan curves in the bios otherwise the fans will not work in combination. Any other fans should be connected to your Chassis fan motherboard connections. The exhaust fan stuck at 100 percent may need to be set for DC in the bios.

If you are still having problems you could try a 3rd party app like FanControl to see if you can get better control over your fans.

Fan Control - A highly focused fan controlling software for Windows

Fan Control is a free software that allows the user to control their CPU, GPU and case fans using temperatures.

getfancontrol.com

 

[Notatallsvelte]

An aio pump should be running at 100%. Possibly that can't be changed.
Read your motherboard manual.

Only thing the mobo says is that the default is max speed for the Ai0 pump header. I could only see settings like turb, silent etc in the bios, they changed nothing.

 

[Notatallsvelte]

Can you manually set the fan speed. IE if you set it to say 50% does the fan run slower. If you can manually change the speed then the fan and motherboard connection are fine it is something related to the software and temperature curve. I like free software called fancontrol so I have not played with much else lately.

Ill look at other options, I dont think so though. I will try other software if needed thanks.

 

[Notatallsvelte]

The EVO cooler's fan closest to the back of the case should be connected to the CPU_FAN connection on your motherboard. Its 2nd fan can be connected to the AIO_PUMP connection since your motherboard does not have a CPU_OPT connection. Both connections must be set for PWM and have the same fan curves in the bios otherwise the fans will not work in combination. Any other fans should be connected to your Chassis fan motherboard connections. The exhaust fan stuck at 100 percent may need to be set for DC in the bios.

If you are still having problems you could try a 3rd party app like FanControl to see if you can get better control over your fans.

Fan Control - A highly focused fan controlling software for Windows

Fan Control is a free software that allows the user to control their CPU, GPU and case fans using temperatures.

getfancontrol.com

Yeah, I get I could try seperating the evo's fans, but that way I get one less fan active in my case, and the cpu seems to get pretty hot at 100%.

 

[Paperdoc]

You meed to change connection points for fans.

1. Remove the cable from the REAR exhaust fan from CPU_FAN and plug it into one CHA_FAN header. In the configuration screen for that header, set Q-FAN Control to DC Mode since this is a 3-pin fan, and that CAN control its speed. Set Fan Profile to Standard and Q-FAN Source to Motherboard.

2. You don't have an AIO cooler system, so you should NOT try to use the AIO_Pump header. That cooler comes with a Y-Splittter so you can connect both of its fans to one header. Use that to connect them to the CPU_FAN header. For its configuration set Q-FAN Control to PWM Mode since these are 4-pin fans. Set Fan Profile to Standard. This header does not have an option for the temperature source sensor - it is fixed and will use the sensor built into the CPU chip. ALSO, this header pays close attention to the speed signal it gets back from its fans to detect fan FAILURE. If that happens it will take actions to warn you and prevent CPU damage from no cooling. If your actual CPU cooler is NOT connected to CPU_FAN you get NO such protective monitoring.

 

[Notatallsvelte]

You meed to change connection points for fans.

1. Remove the cable from the REAR exhaust fan from CPU_FAN and plug it into one CHA_FAN header. In the configuration screen for that header, set Q-FAN Control to DC Mode since this is a 3-pin fan, and that CAN control its speed. Set Fan Profile to Standard and Q-FAN Source to Motherboard.

2. You don't have an AIO cooler system, so you should NOT try to use the AIO_Pump header. That cooler comes with a Y-Splittter so you can connect both of its fans to one header. Use that to connect them to the CPU_FAN header. For its configuration set Q-FAN Control to PWM Mode since these are 4-pin fans. Set Fan Profile to Standard, This header does not have an option for the temperature source sensor - it is fixed and will use the sensor built into the CPU chip. ALSO, this header pays close attention to the speed signal it gets back from its fans to detect fan FAILURE. If that happens it will take actions to warn you and prevent CPU damage from no cooling. If your actual CPU cooler is NOT connected to CPU_FAN you get NO such protective monitoring.

Which fan do I sacrifice then? I have an intake at the back of the bottom, the psu's fan, another intake at the front of the bottom, and a final intake at the bottom of the front. An exhaust at the top of the back, and a 2nd exhaust at the top.

 

[CountMike]

Which fan do I sacrifice then? I have an intake at the back of the bottom, the psu's fan, another intake at the front of the bottom, and a final intake at the bottom of the front. An exhaust at the top of the back, and a 2nd exhaust at the top.

Connect both CPU cooler's fans together to CPU_FAN header, that's where it belongs, Use "Y" splitter cable if needed. AIO_pump header is no place for air coolers, most of the time it's not even adjustable.

 

[Paperdoc]

First, thamks for marking my post above as the Solution.

Which fan do I sacrifice then?

That's easy. ALL of the case ventilation fans should be connected to CHA_FAN headers, and all of those headers configured in the same way (except for one item). Your problem, I assume, is that you have 4 such fans but fewer CHA_FAN headers. Well, look at that Y-Splitter accessory supplied with your CPU cooler. It is used to connect two fans to one header. You can buy another of those at any computer parts shop. Most of them will have more than two outputs. All will have 4-pin designs, but you can use them for either fan type. Use one of these to connect two or three of your case fan to one mobo CHA_FAN header.

Now, there are things you need to know and pay attention to in doing this. The first is that almost all mobo fan headers can supply power to fans at 12 VDC and up to 1.0 A total current to all the fans on that one header. So you look at the label on each fan (or at its website) to find the max current spec for it. Add up the max current for all the fans you plan to connect to ONE header using a Splitter. As long as that total is less than 1.0 A, you are OK.

There are two different types of devices on the market for connecting several fans to one header: Splitters and Hubs. Too many sellers use those terms as if they mean the same thing and they are NOT. A SPLITTER is simple. It has one input "arm" with a female connector that plugs into a mobo fan header. It has two or more output "arms" with male (with pins) connectors for plugging in your fans. That's it. All it does is connect all its fans in parallel to the header so all fan power comes from that header, and all fans get exactly the same power supply. A HUB is similar, but it has one EXTRA "arm" that connects to a power output (4-pin Molex or SATA) from the PSU. It gets all power for the fans from the PSU and draws none from the mobo header, so the Amp limit does NOT apply. However, because of design details this type of device can be used only with the newer 4-pin PWM fan type, and only with a mobo header that is sending out signals in that PWM Mode. It cannot control the speed of any 3-pin fan.

Visually a SPLITTER may appear to be a collection of cable arms, or a small circuit board with edge connectors, or a box with connectors recessed in holes. A HUB also may look just like that, so you cannot tell from that appearance. The distinguishing difference is the presence of that THIRD connection to the PSU for a HUB.

For your situation, OP, you appear to have at least one 3-pin fan and some 4-pin fans for case venting. Each of those types requires that the header that feeds it be configured properly for either Voltage Control Mode (aka DC Mode) for 3-pin fans, or PWM Mode for 4-pin fans. So you cannot mix the two fan types on one header using a Splitter. But you CAN create two different groups according to fan type. For example, use one Splitter to connect three 4-pin fans to one CHA_FAN header (provided their total max Amps is under 1.0), and set that header to use PWM Mode. Then connect any 3-pin fans using another Splitter (if more than one fan) to a different CHA_FAN header and set that to DC Mode.

Any fan header can deal with the speed signal sent back to it from only one fan. So any Splitter or Hub will send back the speed from only one of its output ports, and ignore the speeds of all its other fans. The "other" fans' speeds will never be "seen" anywhere. For a Splitter or Hub that looks like a collection of cables, look closely at the output male connectors. Only one of them will have all 4 pins, while all others are missing Pin #3 so it cannot make a connection for the speed line. So you must ensure that one fan is plugged into that one output with all 4 pins. For a units that look like a circuit board or a closed box there will be some marker on ONE output of the only port that will send back its fan's speed, so connect a fan to that one.