Push Pull Fan not matched RPM in Sentry LX

bulldog147 · 26 Jan 2010 at 21:34

I wired both push and pull fans separately as Fan 1 and Fan 2 on my Nxzt LX Fan Controller and set it to manual mode. I can't seem to get both fans matched in RPMs each. How do I resolve this? Currently it is running at 1,600RPM for PUSH and 1,500RPM for PULL. Surely, they should match? Any ideas? (On occasions they do match at 1,500 RPM on both sides, but not all the time). The cpu cooler is Megahalems

RJC · 26 Jan 2010 at 21:47

You probably will get difference in the reading's due to the calibration and sensitivity of the speed sensor.

JonJ678 · 26 Jan 2010 at 22:25

Plus even if the fans are identical they'll spin at different speeds since one is pushing into a resistance and the other pulling from one, the fan will be better at one of these modes than the other so will see less resistance from one and spin faster.

It'll be interesting to see if they stay the same way if you swap them over, as this will tell you which one of RJC and I are closest to correct. I have a nasty feeling its RJC.

arknor · 26 Jan 2010 at 22:29

the one pushing should make the one pulling spin even if its turned off? like when you blow at the fan blades.

it probably accounts for the extra 100rpm your seeing