How do you control the speed of a D5 PWM pump?

JaseUK · 9 Feb 2015 at 20:51

Hi guys,
In a right pickle at the moment with this pump and need some help please

I purchased an Alphacool Laing D5 VPP655 PWM pump which has an a Alphacool top on it.

I have powered it using the molex but whenever I attach the 2 pin PWM wire to my motherboard cpu header it runs the pump at full speed.

Whenever I unplug the PWM from the motherboard it throttles right down.

I have changed settings in my bios but to gain.

Have I got a duff pump?

I knew I should have stayed with the D5 vario.

Any ideas guys?

vsg28 · 9 Feb 2015 at 21:01

Nah mate, it's fine. When the PWM header is removed, the D5 PWM defaults to about 60% PWM signal rather than 100%. When you connect it to a proper PWM header then you default to 100% (or last saved setting anyway) and then you can control it properly.

JaseUK · 9 Feb 2015 at 21:18

vsg28 said:
Nah mate, it's fine. When the PWM header is removed, the D5 PWM defaults to about 60% PWM signal rather than 100%. When you connect it to a proper PWM header then you default to 100% (or last saved setting anyway) and then you can control it properly.

My BIOS has settings for the CPU_OPT and CPU headers but when I change them to either Normal, Silent, Manual or Fast it doesn't change the speed of the pump.

vsg28 · 9 Feb 2015 at 21:56

What do those options mean though? Try manual mode and see if you can actual change the PWM signal %.

mjones1 · 9 Feb 2015 at 22:51

I'm assuming he has a gigabyte board so you should download the smart fan software. You should be able to create your own fan curve and manually set the speed.

JaseUK · 11 Feb 2015 at 09:54

mjones1 said:
I'm assuming he has a gigabyte board so you should download the smart fan software. You should be able to create your own fan curve and manually set the speed.

Thanks I'll give it a go

JaseUK · 11 Feb 2015 at 11:59

Gigabyte app centre and speedfan don't work. Time to get rid of the D5 PWM because if I cant control the speed of it I don't see the point of having it fitted. I knew I should have just stayed with the DDC pump that worked great for 6 years or so until it gave up the ghost.
Cheers for the help guys.

vsg28 · 11 Feb 2015 at 13:34

Yeah I haven't had great success with Gigabyte's control software myself. Hope the next one works for you.

belankins · 12 Mar 2017 at 14:12

https://plus.google.com/u/0/+NerioLaboratory/posts/hiBw9w8sc2N

ubersonic · 13 Mar 2017 at 10:13

JaseUK said:
How do you control the speed of a D5 PWM pump

You buy a D5 vario and set it manually ^^

deFiniLoGy · 13 Mar 2017 at 10:16

Or spend more and get an Aquacomputer D5 USB, the only D5 that you can control via software without any hassle or compatibility issue.

jaminben · 21 Mar 2017 at 13:22

Does the speed of a pump affect the overall temperature of the loop all that much?

deFiniLoGy · 21 Mar 2017 at 13:27

jaminben said:
Does the speed of a pump affect the overall temperature of the loop all that much?

Yes, but not linearly, the more accurate measurement would be the flow rate.

Evil-I · 21 Mar 2017 at 14:54

Personally I run mine using a Aquacomputer aquero 5LT.

Runs pump and all my 10 rad and case fans I also run 6 separate temperature sensors, great tool if you're watercooling and as its microprocessor controlled, once all setup its doesn't require windows .

Bolton7935 · 29 Mar 2017 at 08:48

i use a small screw driver and do it manually had it running full speed for 2 years cant even hear it