Swiftech MCP655-B

[Sincoura]

Hello all! :lol:

I recently finished my whole watercooling setup, which included the Swiftech MCP655-B pump. When I turned it on however the noise of it stood out immediately. I know my rig would be silent if not for this, but unfortunately I opted for the pump version that does not have speed adjustment built in.

The pump uses 4 pin molex for it's power, so I was wondering if there was a way to perhaps limit the amount of power going to it in order to slow it down, thus reducing noise?

Please comment for ideas/advice.
Hope what I'm saying makes sense.
Thanks.

-P.S:
Returning the pump for it's speed adjustment counterpart is not an option unfortunately.

 

[airdeano]

the non-speed control units shouldn't have that much "noise'. sure you got "all"
the air out of the system? thats bascally the culprit on D5 racket, adjustable or
not. the voltage requirements are 8v to 24v.. running it @12v doesn't leave alot
of "undervolting" possibilities. but you might be able to use a fan speed reducer
temporarily to diagnosis the issue.
i think you still have a captive air pocket or lock.. even my bayres D5 is quite once
the air is all gone or bled out.

 

[Sincoura]

Thanks for your reply.
Yes, after meticulously checking every inch of the tubing and res I can safely say there is no air left. It's not that big a deal I suppose but it's a very annoying whining noise.
Could you explain what you mean by "Fan Speed Reducer"?
I've tried plugging in the attached 3 pin to the motherboard and trying to change the speed in the bios, as well as SpeedFan and even plugging it into a Fan controller. I can assume then that the attached 3 pin has no affect on speed.

 

[airdeano]

the blue wire from the pump is a "tach" wire. there is no speed control, just
monitoring to a header and through a monitoring software as a fan speed.

they are releasing a PWM style D5 pump for informational value.

the reducer is a resistor placed in-line of the 12v+ and cuts voltage down through
resistance. most fans have a resistor with a close value to mock-up a molex
connection with it and see if the noise moves with pump RPM changes.
one thing about radiators.. they are not transparent and can hide the smallest
and biggest air bubbles. and when there is air, the pumps fighting the air pocket
pressure, thus making louder than expected noise.