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This review is from: APEVIA CF7015S 70mm Case Fan
Pros: When I ordered these fans I looked long and hard for 70mm <2000rpm fans that seemed high quality. These did fit the bill and, when installed, did function quietly and properly.
Cons: After exactly one year both of the fans died at the same time, silently without warning. I believe it was a cascading failure of one fan that led the other do die quickly thereafter. smartctl sent me an email telling the that my disk array was >190C! I had to use gloves to remove the drives from their bays :/
Other Thoughts: Next time I'm going with a more trusted brand.READ FULL REVIEW
This review is from: EVERCOOL F-EC7015H12BP 70mm Dual Ball PWM Fan
Pros: This is one of the only 70mm PWM fans that I could find that seemed to be high quality, with a wide range of duty cycles.
Cons: These fans are moderately pricey, which would be okay if I even believed for one second that at 25% duty cycle this things emit ~17 dBa of noise. They sound like vacuum cleaners starting at 25%, and are like jet engines at 100%.
Other Thoughts: Just save yourself the frustration, and if you need a quiet 70mm fan skip out on the PWM and just get a cheaper, quieter model.READ FULL REVIEW
Pros: These are cheap, and relatively fast.
Cons: Recertified hard drives don't inspire much confidence in reliability. Use these in a redundant setup, and don't forget to set up error reporting in case one of these actually dies.
Other Thoughts: I'm using these in a raidz1 setup using ZFS under ZFS-fuse in Linux. Everyone that complains about the noise of this drive should know that every recent hard drive has acoustic management settings built in. Under Linux, you can use "hdparm -M 128" to silence the drive. The acoustic management in the firmware has settings from 128 (silent) to 256 (noisy). The default for this drive is 256. There should be a comparable utility for Windows.READ FULL REVIEW