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H50 0rpm?

M

mhenley

[H]ard|Gawd
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Jul 21, 2001
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Just upgraded my rig to a 1090t with an H50. First impression, WOW!!! I've never seen temps this low. 35-38c @ full load, higher temps later in the day when the room is a tad warmer. I've been keeping HWMonitor up, and I've noticed that the water pump will occaisonally read 0, and then after about 5 seconds return to it's normal reading of about 1336rpm. Is this a sensor issue, or does the pump stop and restart itself?
 
Sounds like you connected your pump to a pin connector on your mother board and the motherboard is controlling the conditions that your pump turns on or off.

As far as I know the pump is either on or off when proper voltage is applied to the motor.
 
Yes, I did connect the pump to a 3-pin header on the motherboard. But I turned AMD CnQ and Qfan off so that PWM doesn't control them, all fans should be running at 100% (although HWMonitor says 99%). I'm not noticing any abnormal spikes in cpu temp, so I'm willing to write this off as a temporary probe glitch. I just hate that momentary feeling of dread when you see something like this drop to zero.
 
You could cut up a fan extention cable and use it to insert a multimeter set-up for current measurement in the feed to the fan. If the current stays constant it's probablly a sensor glitch, if the current goes up it's probablly the pump stalling, if the current falls to zero it's probablly the motherboard turning the pump off.
 
If I find that the pump is stalling, is that cause for return, or is that normal? This is my first experience with watercooling.
 
plugwash said:
You could cut up a fan extention cable and use it to insert a multimeter set-up for current measurement in the feed to the fan. If the current stays constant it's probablly a sensor glitch, if the current goes up it's probablly the pump stalling, if the current falls to zero it's probablly the motherboard turning the pump off.
Click to expand...

That is what I would do.

I run my H50 cooler pump connected straight to a 12volt 4pin power source from the PSU.
 
I can't tell if there is a hiccup or not, but after doing some tests it would appear as though the PWM is only running 99%, and during the occaisonal time that the probe checks exactly when that tiny 1% point happens, it shows 0rpm. I will join the club and get a 3pin to 4pin adapter and run it from a molex connector instead of a fan header. Thanks for the tip.
 
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