CPU_Opt and CPU_Fan again

morbidflorist

morbidflorist

morbidflorist

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Joined
19 Nov 2011
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Hey

Im slightly confused as to where I should plug in waterblock and fans (Silverstone TD02, mobo: gigabyte z97mx gaming 5)

Checked other posts and found conflicting information

Giggz said:
Pump wants to be on cpu header not opt.
Click to expand...

setter said:
Should work on either header tbh. Opt cpu fan connectors are the same as the cpu one. Theyre a recent addition to mobos due to the rise in popularity of dual fan heatsinks.
Click to expand...

Divine Pain said:
The cpu_opt fan header runs the full 12v regardless, you want to connect the pump header to this.

Connect the CPU fan to the other one so you can set fan profiles for it
Click to expand...

So does it matter? I tried connecting waterblock to CPU_Opt and radiator fans to CPU_Fan (using y splitter). I noticed that those two fans are running at different speeds. Is it normal? (They're SP120s "performance" edition and are bloody noisy)

Thanks

D
 
fans have 7v extension so I will try it. All this fiddling with TD02 radiator will probably lead to the usual stripped screw holes scenario though:)

Question - can I plug the 7v step-down cable straight into CPU_Fan and then attach y-splitter to it?

D
 
Last edited:
step down cable in - and that's what im getting after heavy civ5 session. Im guessing those temps are acceptable?

faajht.png
 
One thing I've noticed was the fan speed in Bios - CPU_Opt was set to "Normal" which means that pump was not running at the full speed. Changed it to Full and its running at 2700RPM. Which Im assuming is how it should be?
 
Nevermind. It looks like got it all wrong.

29aqsyg.png


Pump should be plugged into "non controllable 12V" header which, in my case, is CPU_Fan while the rad fans should be plugged into CPU_Opt which will allow me to control their speed.

Am I getting this right?
 
Your CPU_FAN looks to be a PWM only header, whilst your CPU_OPT features some other form of control on Pin 2, likely to be straight DC voltage or a 12v PWM signal to simulate DC voltage control.
 
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