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bobkoure · 05-05-2004, 09:56 AM

As an experiment I just "stacked" a second Panaflo L1A on the one I've currently got set pulling air through a chevette core.
Both fans are undervolted to 5V (set up for quiet).
Idle temps went from ambient+12 to ambient+8 or +9.
Noise level with the additional fan is slightly higher (adding a second identical noise source should theoretically add 3dB) and to my ear at least, seems quieter than a single L1A at 7V, which seemed to result in ambient+10 (all readings from the CPU diode, inaccurate, 1C difference probably means nothing, 3 or 4C difference means, IMHO, something changed - even with an inaccurate diode... I am using the thermometer in a wall-mounted thermostat for "ambient" - my "motherboard" (really case temp) readings are often the same, so I think that temp's about right...

I have not remounted the CPU/wb between readings (the other thing that might alter things.
Just someone here might find this of interest - probably should also post it over in the silent-pc watercooling forum, although my PC is actually pretty noisy (probably between 16 and 20dB - by meter doesn't go this low so I'm guessing) compared to the results folks are getting there...

05-05-2004, 09:56 AM	#1
bobkoure Cooling Savant Join Date: Feb 2003 Location: USA - Boston area Posts: 798	stacking undervolted fans As an experiment I just "stacked" a second Panaflo L1A on the one I've currently got set pulling air through a chevette core. Both fans are undervolted to 5V (set up for quiet). Idle temps went from ambient+12 to ambient+8 or +9. Noise level with the additional fan is slightly higher (adding a second identical noise source should theoretically add 3dB) and to my ear at least, seems quieter than a single L1A at 7V, which seemed to result in ambient+10 (all readings from the CPU diode, inaccurate, 1C difference probably means nothing, 3 or 4C difference means, IMHO, something changed - even with an inaccurate diode... I am using the thermometer in a wall-mounted thermostat for "ambient" - my "motherboard" (really case temp) readings are often the same, so I think that temp's about right... I have not remounted the CPU/wb between readings (the other thing that might alter things. Just someone here might find this of interest - probably should also post it over in the silent-pc watercooling forum, although my PC is actually pretty noisy (probably between 16 and 20dB - by meter doesn't go this low so I'm guessing) compared to the results folks are getting there...