Hi. Newbie here

Wbgarwood · November 28, 2019

so I have a pwm question.

I have a waterblock on my 2080ti. I used the fan hubs on that 2080 ti to control 3 radiator pwm radiator fans. one fan is plugged directly into the header, 2 fans are using a ekwb 2 way splitter. when using msi afterburner or cpuid hwmonitor only one fan follows the fan curve I set in msi. the one fan not on the splitter. the other two fans seems to be running at 100% although any monitor says they are running at 0%.

gpu adapter
https://www.overclockers.co.uk/ek-water-blocks-ek-cable-pwm-fan-adapter-for-gpu-50cm-wc-9d9-ek.html

splitter
https://www.overclockers.co.uk/ek-water-blocks-ek-cable-y-splitter-2-fan-pwm-10cm-wc-551-ek.html

fans
https://www.overclockers.co.uk/thre...120mm-fan-radiator-performance-bu-001-pt.html

have I brought the wrong parts or is it something else?

ive tried speedfan and my motherboard bios to control fan speeds and none of them work properly yesterday this seemed like the best option.

many thanks guys.

Bombastinator · November 28, 2019

I’m going vaguely with “bought the wrong parts” specifically the splitter.

PWM uses only one wire to detect speed, so if you split it into two, not only can it no longer detect just one it can’t detect any of them correctly

the standard move is to use a multi port fan controller and have only one fan in each port on the controller.

Wbgarwood · November 28, 2019

Hi dude

Thanks for the reply.so I managed to sort the problem. We'll ish.... So one of the headers was putting out 100% fan speed all the time. No idea why why any software couldn't read the speed at all though. I double checked the old fans and they are definitely plugged into the right headers.

So any way I swapped the 2 way splitter with a 3 way and now have all 3 fans running off one header that would read on the software monitors. Works seemlessly. After 20 mins of stress tests fans ramped up as per the curve I set after a few hours of gaming fans never went above 60% keeping it cool at less than 50c. So much quieter now. That problem was driving me mad.

Thanks again.