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bobkoure · 11-10-2004, 10:58 AM

I got a pair of Nexus 120mm fans in to try with my 6x6x2 heater core.
I had previously been using a pair of 120mm Panaflo L1As (grey label) at 5V, stacked on the pull side with a 25mm plenum (hollowed out fan body) between.
This previous setup worked about the same (MBM based - diode minus case) as a single L1A at 7V but was quieter.
While I was at all this, I tried various configurations of push/pull, push-stacked, and pull stacked and tended to get best results with pull stacked (typically push/pull offered no benefit over single pull)

So.. I have tried the Nexus fans
- single pull - same temps as 7V L1A / stacked pull L1As at 5V
- stacked pull - 1 or 2 C cooler than 7V L1A / (as above).

Single or stacked, they are quieter than a single L1A at 5V (which was useless with a 2" radiator, BTW).
Stacked, slightly louder than single (no idea if it's actually the theoretical 3dB or not - too quiet for my ears to tell - will try all this again the next time I'm up at 2AM and it's quiet around here...
I may also try speed-controlling the Nexus' down to the same apparent noise level as a single one and see how that compares temp-performance wise.

CAVEAT : I am measuring / comparing sound with my ears all be it late at night when background noise is low - and I am measuring airflow performance by looking at the delta between case temp and diode temp as reported by MBM which isn't any kind of accurate or even linear (although case temps seem to go up and down exactly in lockstep with the temp readings of the wall thermostat.)

note - I also posted this in this thread at SPR.

11-10-2004, 10:58 AM	#15
bobkoure Cooling Savant Join Date: Feb 2003 Location: USA - Boston area Posts: 798	Nexus with 6x6x2 rad I got a pair of Nexus 120mm fans in to try with my 6x6x2 heater core. I had previously been using a pair of 120mm Panaflo L1As (grey label) at 5V, stacked on the pull side with a 25mm plenum (hollowed out fan body) between. This previous setup worked about the same (MBM based - diode minus case) as a single L1A at 7V but was quieter. While I was at all this, I tried various configurations of push/pull, push-stacked, and pull stacked and tended to get best results with pull stacked (typically push/pull offered no benefit over single pull) So.. I have tried the Nexus fans - single pull - same temps as 7V L1A / stacked pull L1As at 5V - stacked pull - 1 or 2 C cooler than 7V L1A / (as above). Single or stacked, they are quieter than a single L1A at 5V (which was useless with a 2" radiator, BTW). Stacked, slightly louder than single (no idea if it's actually the theoretical 3dB or not - too quiet for my ears to tell - will try all this again the next time I'm up at 2AM and it's quiet around here... I may also try speed-controlling the Nexus' down to the same apparent noise level as a single one and see how that compares temp-performance wise. CAVEAT : I am measuring / comparing sound with my ears all be it late at night when background noise is low - and I am measuring airflow performance by looking at the delta between case temp and diode temp as reported by MBM which isn't any kind of accurate or even linear (although case temps seem to go up and down exactly in lockstep with the temp readings of the wall thermostat.) note - I also posted this in this thread at SPR.