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Pros: They move lots of air when used as case fans. I have had no problems with any sort of noise in any mounting configuration. I have two on the top pushing air out and one one it side pulling air through some of my hard drives and one pushing air through my hard drives and one more acting as an exhaust fan at the back of my case. When I bought them a friend recommended them, but they didn't have any PWM speed controlled version out or at least New Egg didn't have them so I got the ones with the resistors to change the speed. I just leave them on full speed as they are extremely quiet. I use my computer for recording music so it has to be quiet. I also have two Noctua coolers for my Opteron 16 core CPU's with two fans each, they are also speed controlled by resistors, but now have PWM speed controlled fans available so that the bios can control them all. I have been waiting for one to die, but no luck. They run all day and often all night most days of the week for the past few years. It looks as though I may just have to get the PWM fans before the ones I have wear out if I want to have the BIOS controll the fan speed. The Cougars are as quiet as the Noctuas. I have a decibel meter I use to balance my speakers for mixing and they read pretty much the same, usually within 1 dB of each other! They also come with a silicone surround that fits the shape of the fan to go between the fan and the case and the option of using bolts/screws or silicone pull through holders. I really fantastic product. The fans that came with my Thermaltake case died within 3 or 4 months. These have been going strong for years!
Cons: None, I suppose if you mounted them incorrectly or had a bad fan (out of round/unbalanced) you could get them to make some noise, but mine don't make hardly any, the dB meter usually reads 17 or 18 dB. If I put the meter in the case and close it and let it read for a few minutes it has never gone over 20dB. The loudest fan in the case is the fan in the power supply, it's a 1600 Watt LEPA.
Other Thoughts: I had thought of using the Cougars on my Noctua Coolers to get the PWM speed control, but it appears they make them now so I'll stick with those for the CPU coolers.READ FULL REVIEW
This review is from: Noctua NF-F12 PWM 120mm Case Fan
Pros: I have owned both brands of fans now for at least 2 or 3 years. My computer is a dual CPU 32 CORE workstation/server that only gets turned off when I go out of town a couple of times a year. They have been running non-stop for years without as much as a tick or a rattle. i do clean the blades several times a year, especially on my Noctuas which are on my 2 Noctua CPU coolers ( fans each) I have been waiting for them to fail so that i can get PWM speed controlled fans (either Cougar or Noctua) to replace them as my computer has an extensive fan control system built in to the motherboard. The same goes for all the Cougars that I use for the case, I bought them when there were no PWM speed controlled fans being made by then or at least the New Egg carried. I am still waiting for those to fail as well. The fans that came with the dase (Thermaltake) failed within months of building it. I got the Noctuas when i upgraded CPU's from 8 cores @ 2 GHz to 16 cores @3.3GHz for each of two CPU's. I also have 4 x 2 TB Black Enterprise Edition 7200 RPM Hard Drive configured as a striped RAID for speed and 2 X i TB Seagate 7200 RPM Drives (the originals) being used as Long Term Storage on the 3 GB/s front Bus the RAID and both SSD's a 256 GB and a 5612 GB are on the Pike card Raid at 6 GB/s. It has 64 GB of registered RAM soon to me 96 GB and a 7850 series amd processor Video Card by Radeon. I use it for Recording Music and processing it, mixing it etc as well as all my other computer needs. There are faster computers out there but few that can match it in the number of things it can do at once without breaking a sweat:) I never overheats and i never get Blue screens (Knock on Wood!) In MHO you cannot go wrong with a Cougar or a Noctua Fan. Just be sure to research all the fans they make and get the fan that best suites your specific needs. As far as CFM; Db; PWM Speed control or manual set speed. and of course what size. They are not inexpensive nor are they made cheaply in any way. The prices are very fair for what you get and I only had to call once to each company with a question and they were extremely professional and friendly and very serious about customer satisfaction. As in I truly believe that if there was a serious problem they would gladly replace the fan with no or very little argument, probably they would just want to know the circumstances in order to send it to their development team to see if it is a recurring problem. That is the feeling they gave me when dealing with them. I don't believe that you can go wrong with either company if you choose the fan that fits your needs, from either company.
Cons: I have non. Once they fail, I will just order replacements, although I think I will get fans that my MOBO can control the speed on. I use them on a computer that it used for recording music including voice, so silence in important. With the manually adjustable speed fans I just put the resister in and they go dead silent, when using the computer for production and mixing or other heavy CPU use jobs I let them run full speed. At full speed they aren't really very loud at all.
Other Thoughts: Read my Comment on the Cougar fans.SAme for Noctuas.READ FULL REVIEW
Pros: I wrote a review of my ASUS KGPE_D16 and in it I said I had problems with MSI boards in the past and I meant to say SUPERMICRO, sorry.
Cons: See Pros.READ FULL REVIEW