PWM Pump help

Malek988 · 13 Dec 2017 at 16:53

Hi guys tomorrow the loops is complete... would have been today but when connecting all the tubing i realised i needed more 90 or 45 degree fittings

Anyhoo My pump has a molex for power which ive gathered but there is also a fan connection.... silly question but does need plugged into a fan header on the board?? All my fans are controlled by grid v2 and cam so i have nothing plugged in to the fan headers currently.... and when I'm filling the loop nothing will be plugged to the motherboard so what speed is pump going to run at??

Thanks in advance.

khemist · 13 Dec 2017 at 18:40

It will run full speed if not connected to a fan header.

mods1965 · 13 Dec 2017 at 19:00

My DDC pump PWM cable is connected to my ASUS GENE CPU header, with power from the molex. ASUS has software to set pump RPM depending on temps in software or I can set RPM in the BIOS.
Not sure about your MSI board, but I expect the same thing. Use the CPU header, not the fan header for the pump as a general rule.
You can also see what your grid v2 provides in terms of RPM control, so maybe that will work instead of using the MSI board to control the pump RPM.

Smffy · 14 Dec 2017 at 13:49

You can control it in the grid also mate, with the pump speed my advice would be tied to CPU but with large flat ranges not curved.

If you had say a curve up with temp targets you’ll find it a bit annoying as it revs up when say you open an app and the CPU spikes in temperature momentarily. Flat ranges mean that won’t happen, you will probably find the flow is adequate with about 35-40% power, keep that flat and stick an increase in at about 60c if required which will stop the jump on and off.

When filling it will run annoyingly slow if it’s older generation, get one of the 24pin jumper blocks here and that should solve the issue and allow full speed while filling - that or use a paper clip to jumper the fan also works but less clean/safe of course.

https://www.overclockers.co.uk/xspc-psu-bridging-connector-24-pin-wc-021-ok.html

Good luck...

Malek988 · 14 Dec 2017 at 23:32

Smffy said:
You can control it in the grid also mate, with the pump speed my advice would be tied to CPU but with large flat ranges not curved.

If you had say a curve up with temp targets you’ll find it a bit annoying as it revs up when say you open an app and the CPU spikes in temperature momentarily. Flat ranges mean that won’t happen, you will probably find the flow is adequate with about 35-40% power, keep that flat and stick an increase in at about 60c if required which will stop the jump on and off.

When filling it will run annoyingly slow if it’s older generation, get one of the 24pin jumper blocks here and that should solve the issue and allow full speed while filling - that or use a paper clip to jumper the fan also works but less clean/safe of course.

https://www.overclockers.co.uk/xspc-psu-bridging-connector-24-pin-wc-021-ok.html

Good luck...

Thanks for the advice, used that very jumper! filled no problem... Grid however the software cam is terrible so many problems, i will be looking for something else to control my fans, but ill keep it in mind for connecting the pump to.

Smffy · 15 Dec 2017 at 12:46

Malek988 said:
Thanks for the advice, used that very jumper! filled no problem... Grid however the software cam is terrible so many problems, i will be looking for something else to control my fans, but ill keep it in mind for connecting the pump to.

It is crap isn’t it... Aquaero recommended, more expensive the the no screen version would be a good bet. I went for that because as you say CAM is bad, particularly it’s compatibility with some fan voltages.

If you have a lot of fans then you can get a few splitty 9s and combine to banks, then control them as sections (which is what I do I have 17 fans in 3 groups)