Z97 Fan Headers

[jab383]

Leaving the pump at full speed keeps the cooling loop ready for spikes of CPU power. That's one of the major advantages of water cooling - the water absorbs brief (15 seconds or less) surges in power without changing its temperature. Its ability to do that depends on running the water around the loop quickly, ie. with the pump at full speed. Slower pump speed means shorter surges the water can absorb.

Jeff

[Raja@ASUS]

In a closed loop system the water temp equalizes fairly quickly so its a moot point in that regard. There may be some head pressure drop, but I doubt it adds up to anything tangible. Ultimately, there is nothing much to be saved by running the pump slower unless it is noisy or one is very hung up on power efficiency.

[bitman]

Ok OK you have convinced me I will run the pumps at full speed and just control the fans with the fan headers. I have these Swiftech MCP665-PWM pumps does anyone know if I leave the PWM lead not connected will the pump run at full speed or do I have to do something else to get them to run at full speed or I'm I going to have to buy 2 new pumps?? Thanks Raja and Jeff!!!

[Raja@ASUS]

The pump should run at full speed. You can even configure the fan header to run at full speed if you wish..

[Elements]

Ok OK you have convinced me I will run the pumps at full speed and just control the fans with the fan headers. I have these Swiftech MCP665-PWM pumps does anyone know if I leave the PWM lead not connected will the pump run at full speed or do I have to do something else to get them to run at full speed or I'm I going to have to buy 2 new pumps?? Thanks Raja and Jeff!!!

The pump should run at full speed. You can even configure the fan header to run at full speed if you wish..

Hello.
As per Martin's testing:

I expected this pump to operate at 100% when the PWM cable is disconnected (that is how the MCP 35X works), however this pump does not do that. Rather than operate at 100%, it operates closer to 60% when the PWM cable is not in use. This could be good or bad depending on what your noise preference is. I find 60% to be a good balance myself.

So you'll need to plug the pump into a header and set the fan curve to full speed :P

[jab383]

"So you'll need to plug the pump into a header and set the fan curve to full speed :P "

Yes, that will work for a low-power pump. You can also use an adapter cable and plug the pump directly into a Molex from the PSU. That will bypass the motherboard and profile setting step.

Second issue -- most motherboard fan headers can supply 1 amp (12 watts) at most. My pump takes more than that, so I have to use a direct PSU connection.

Jeff

[Elements]

"So you'll need to plug the pump into a header and set the fan curve to full speed :P "

Yes, that will work for a low-power pump. You can also use an adapter cable and plug the pump directly into a Molex from the PSU. That will bypass the motherboard and profile setting step.

Second issue -- most motherboard fan headers can supply 1 amp (12 watts) at most. My pump takes more than that, so I have to use a direct PSU connection.

Jeff

Jeff, if you take a look at this link , the specific pump bitman has (MCP655 PWM) is plugged into Molex, but still only runs at up% with no PWM cable plugged in

[Praz]

Hello

This is not a difficult obstacle to overcome. The power lead from the pump goes to a Molex connector and the PWM/RPM lead connects to one of the motherboard fan headers. Configure the UEFI for full speed for that fan header.

[FlanK3r]

This thread is exactly the one, what I need for proof to others guys .
btw, hi Praz, you are everywhere too

[JackNaylorPE]

Why is there confusion on this topic ?

1. With Z87, numerous Asus sources , including the manual, said they were all PWM.

2. The message is not uniform from all Asus sponsored forums

http://vip.asus.com/forum/view.aspx?...Language=en-us