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How is NZXT Sentry Mix doing 50w per ch with 2 molex while Lamptron FC9 needs 3?

post #1 of 5
Thread Starter 
I'm reading this review on the Sentry Mix at benchmarkreviews.com and they're saying:
Quote:
The Sentry Mix is designed for 50 watts per channel. If an end-user were to ever actually use the full rating of the fan controller, that would be 300 watts. However, if you visit the site for Molex, and check out the spec for the maximum Ampacity of a Molex connector, you will find that it is rated for only 10 amps or if you visit your wiki, you can see Molex 8981 Series is rated at 11 amps per pin. It's somewhat confusing that such a ubiquitous connector has so many disparate values for ampacity. Nevertheless, the interesting thing is that basically, a Molex connector is limited to somewhere around 10 to 11 amps.

The formula for Power (watts) = I * V where power is watts, and I = amps, and V = voltage. So, a little math shows us that 300 Watts = I amps * 12 volts (the operating voltage of the controller).

We solve for I, and get 25 amps. Perhaps, there is something missing here, (and I will be more than glad to change these calculations if someone can provide reasonable proof of error), but it appears that the 2 Molex connectors are under sized for the maximum rating of the controller by about 3 to 5 amps (depending on who you believe, Molex or the Wiki).

Finally, the wire used to splice the Molex connector into the 3 pin connector was 16 AWG. According to the Handbook of Electronic Tables and Formulas for American Wire Gauge, the maximum is 22 amps for 16 gauge hookup wire. So, again, it appears the wiring is just slightly under sized for the maximum continuous rating of 50 watts per channel. We have forwarded this concern to NZXT and we are waiting on the final response.

While the Lamptron FC9 REQUIRES 3 male molex to be connected in order to function properly. How is 50w per channel possible on the Sentry with spliced molex connectors? I don't see how it can provide 300W of power if someone where to ever maximize the fan controller.
 
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post #2 of 5
It makes you wonder doesn't it... I guess they hope that no one actually pulls 300W - ever
post #3 of 5
Thread Starter 
I'm reading reviews on Newegg about the Sentry Mix and people are saying it's causing fans to make noises they aren't supposed to. How does a fan controller cause a fan to make noises? Unstable power delivery on the controller side?
 
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post #4 of 5
Can't say for sure. Could be user error or something else? Theres no way to really know but I would bet its the PWM circuit for the output voltage... and a lot of fans do not run well or work at all with this type of design. I know Lamptron had similar issues with its controllers (FC2/3/4) way back when (IIRC...fan motor buzzing when undervolting)
post #5 of 5
Quote:
Originally Posted by kikkO View Post

I'm reading reviews on Newegg about the Sentry Mix and people are saying it's causing fans to make noises they aren't supposed to. How does a fan controller cause a fan to make noises? Unstable power delivery on the controller side?

All fan controller that makes the fan Unstable power delivery is Unstable power delivery. This is included in any fan you can think of even ceiling fan.
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Black Hawk
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