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Vitalius

4 pin PWM water cooling pump on motherboard fan header designed for that: DC vs PWM mode different performance?

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Posted · Original PosterOP

I have this motherboard:
https://www.asrock.com/mb/AMD/Fatal1ty AB350 Gaming-ITXac/index.asp

Here is the manual:
http://asrock.pc.cdn.bitgravity.com/Manual/Fatal1ty AB350 Gaming-ITXac.pdf

I have this pump:
https://www.ekwb.com/shop/ek-ddc-3-2-pwm-laing-ddc-3-2-pwm
ddcpwm-1_1200_1.jpg

It is now wired like this:
JPEG_20180721_182650.jpg

Going out to this:
02-1.jpg

So ending up like this on the motherboard (sorry about it being dark):
JPEG_20180721_182715.jpg

Now this motherboard supports doing this as it says in the manual:
image.png.9803f5b37731c42fdc197483c9152535.png

Which is what the specifications for that pump are, as listed on the site:

Quote

Technical Specifications:
- Dimensions (W x D x H): 90 x 62 x 38 mm
- Motor: Electronically commuted ball bearing motor
- Rated voltage: 12 V DC
- Power consumption: 18 W
- Maximum head pressure: up to 5.2m
- Maximum flow rate: up to 1000 L/h
- Maximum liquid temperature: 60 °C
- Materials: Stainless steel, PPS-GF40, EPDM O-rings, Aluminium oxide, hard coal
- Power connector:  4-Pin Molex- and 4-Pin PWM FAN connector

And in the manual, it says this:
image.png.f99cad8a196c7840c403183c795972c6.png

 

In the BIOS, I have these options:
image.png.5be742382bee5f3c8fadffcb57e0d0e0.png

 

I've switched it to W_PUMP, and set it to PWM Mode, but when I do this, it is stuck at 100% speed at all times. In the manual, it says this:
image.png.a6f017de92427eccd51fd5e493561923.png

If I choose DC mode, it barely runs the pump at all (10-20% speed I guess). I can hear/feel it running, but it's so slow that my CPU gets up to 50-60C on idle. 

I want to control this pump with PWM, but it doesn't respond to any settings I give it in BIOS.

What are these two different modes and why are they interacting with this pump in this way?


† Christian Member †

For my pertinent links to guides, reviews, and anything similar, go here, and look under the spoiler labeled such. A brief history of Unix and it's relation to OS X by Builder.

 

 

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use PWM and put it on water pump mode

 

DC mode reduces voltage from 12v at full load to vary the pumps power, while PWM mode turns the pump on and off to control its speed. PWM preferred for pumps because it keeps the torque of the pump high and speed control smooth, while DC mode will be like 'no speed at 30%, 50% speed at 50%', for example


The best thing to do is reading the clock speed that doesnt end in a pair of zeros

CPU: i7-2600K 4745MHz 1.408V (software) --> 1.4?V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.2MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2200MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1

 

Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: 1TB HP EX920 PCIe x4 M.2 SSD + 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172), 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally Monitor: 1080p 126Hz IPS G-sync

 

Desktop benching:

Cinebench R15 Single thread:168 Multi-thread: 833 

SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s

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Posted · Original PosterOP
8 minutes ago, Jurrunio said:

use PWM and put it on water pump mode

 

DC mode reduces voltage from 12v at full load to vary the pumps power, while PWM mode turns the pump on and off to control its speed. PWM preferred for pumps because it keeps the torque of the pump high and speed control smooth, while DC mode will be like 'no speed at 30%, 50% speed at 50%', for example

Cool, so, my problem is that the two modes don't work as expected. PWM keeps the pump at 100% even when I set the performance curve. DC keeps the pump at 20-30% regardless of settings.


† Christian Member †

For my pertinent links to guides, reviews, and anything similar, go here, and look under the spoiler labeled such. A brief history of Unix and it's relation to OS X by Builder.

 

 

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32 minutes ago, Vitalius said:

Cool, so, my problem is that the two modes don't work as expected. PWM keeps the pump at 100% even when I set the performance curve. DC keeps the pump at 20-30% regardless of settings.

Maybe a BIOS update will help? Asrock BIOS arent the best


The best thing to do is reading the clock speed that doesnt end in a pair of zeros

CPU: i7-2600K 4745MHz 1.408V (software) --> 1.4?V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.2MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2200MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1

 

Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: 1TB HP EX920 PCIe x4 M.2 SSD + 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172), 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally Monitor: 1080p 126Hz IPS G-sync

 

Desktop benching:

Cinebench R15 Single thread:168 Multi-thread: 833 

SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s

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