DDC Pump controll

[Seba2150]

Hi Everyone,

I hope someone some one will be able to help me.

I've got a DDC pump (10W) running in my system atm.

The pump is powered via a molex straight of the PSU with only the RPM tacho signal going back to Mobo. The pump is quite noisy as its running at full 12V wack all the time.

I was hoping that I could re-wire the pump to use the Mobo header to power the pump and the use DC control in the BIOS to set it at let say 9V as I know that some of the DDC pumps will not start at a voltage lower that this.

My mobo (Asus Z97 gryphon) can support a max of 1A @ 12V at each fan header, confirmedd by an Asus techie so in theory it could run the pump because doing some maths ( I=P/V ) means that the 10W DDC would pull 0.833 amps at full wack. Which is in the safe region, I still plan to lower the pumps voltage. I will use the CPU fan header for this.

Just wanted to get other peoples input on this before I do this and potentially burn the pump or worse the Mobo or other component of my system..

Am I missing something or got something wrong?

Any input will be greatly appreciated.

Many thanks,

Seb.

 

[MadShadow]

I'm sure you can get some kind of voltage/fan speed reducer so you can just power it without having to use the BIOS to change settings.

 

[Seba2150]

Yea, my other option is to get a Mcubed fan amp and use that but thought I ask the question before as running it using the Mobo is much cleaner solution in my opinion.

 

[Bartacus]

Wouldn't this only work on a PWM pump though in theory? My setup is a few years old, but I didn't think you could control voltage on a motherboard header in the BIOS? If that's the case, I'm really behind the times.

 

[Seba2150]

In the BIOS of my motherboard (Z97 platform) you can switch between PWM and DC control on each of the headers so I think it should work, I've controlled 3 pin fans this way before

 

[Bartacus]

Oh cool, ignore my useless arse then, LOL! My old x79 board can't do that fancy schmancy stuff.

 

[Seba2150]

Haha! No props. I've said it before, any input will be greatly appreciated
I'll need to check the BIOS again as it been a while since I was in there so I might be wrong.