Rampage V Extreme CPU fan header and D5 pump not working.

[orian]

Hi everyone,

I have the Rampage V Extreme and two EK D5 PWM pumps. The issue I have is that when I plug either D5 pump into the CPU or CPU OPT fan header, the pump does not spin, it goes down to 0%. When I plug the pump into a chassis fan header, the pump runs at it should and goes to 100% (~4,700 RPM).

This behavior occurs with either of the D5 pumps so I assume they're not at fault. I would like to use the CPU headers as it will be a bit of a failsafe should a pump die, but I can't seem to figure out what I'm doing wrong and why they don't spin at all when I connect them to either CPU fan header. Any insight would be appreciated. Thanks!

 

[LTC8K6]

23 watts may be too much for the fan header?

 

[stahlhart]

Have you tried disabling CPU Q-Fan Control in BIOS?

 

[LTC8K6]

https://shop.ekwb.com/media/catalog...39433887a97daa66f/d/5/d5-pwm-front_800a_1.jpg

Are you connecting it correctly? Signal cable and molex?

I presume the molex is because the fan header can't supply 2 amps?

 

[orian]

Thanks guys. I'll try to disable Q-Fan on those headers and will report back. Also, the pump gets power from a molex plug and only gives the motherboard RPM signal via the fan header.

 

[LTC8K6]

The pump should run at a fixed speed without the PWM signal. It does not need the PWM signal, I think.

 

[orian]

Yes, it runs at around 40% without the PWM signal. Thanks!

 

[orian]

PWM was too low by default. I turned it up and it works great now. Thanks for the help everyone!