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  1. #21
    ROG Enthusiast Array
    Join Date
    Dec 2011
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    25

    I've tried 9-blade fans. PULL: Scythe SY1225SL12M (1300RPM), PUSH: SilverStone FM121 (max rotation, 2400RPM)

    With this configuration putting on a fan grill on the PUSH fan did not create a whining sound, if anything, a very faint one. But, the SilverStone fan by itself was creating a higher pitched annoying whining sound.

    When the two fans spin at different RPM the radiator does emit a low tone sound. So it's best to use same speed fans to avoid it.

    I created a few wave files and will put them up shortly to show the difference between fans and fan speeds.

    I ended up going back to the stock H80 fans, both speed-controlled by the water block. At idle they're quiet enough, more quiet then my old air cooler setup which was using the above mentioned SilverStone fan.

  2. #22
    ROG Enthusiast Array
    Join Date
    Dec 2011
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    Ok, I'm finally happy with my temps and my decibels.

    I've ended up using SilverStone FM121 as the pull fan, currently running at 1700-1800RPM. The push fan is stock H80 connected to the water block which itself is set to MAX performance, but still the fan rotation is temperature controlled - low rpm at idle and mid/high at load.

    I chose this configuration because I wanted to be able to control my pull fan externally which FM121 allows me to do, plus I already had my case set up to use that fan as it was cooling my old Phenom II x4. The water block does a good job at controlling the speed of the push fan. With the water block set at MAX performance I get best cooling when needed and quiet when idling.

    Here are links to the wav files I've created testing various fan setups (24MB rared).
    www.megaupload.com/?d=IKHMLXGH
    http://www.fileserve.com/file/w8HacB2/fan_acoustics.rar

    How I tested. The microphone was about 5-6 cm away from the radiator and to the side of it. I've started at the meeting point of the radiator and the push fan. I moved the mic parallel to the radiator in the direction of the end of the case. I then circled slightly pointing the mic at the side of the exhaust of the pull fan, then reversed direction to go all the way to the intake side of the push fan. Finally I went back to the starting point and hit stop recording.

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