In any event, anyone familiar with watercooling is familiar with Petrastechshop. They have this to say about the F PWM series: Dedicated to operate 24 hours a day, 7 days per week, the F PWM CO series case fans cool your computer system quietly. It's just the YLs that I buy from Petras. The F12 PWM is the PWM version of Arctic’s traditional-frame 120mm fan (they also sell a cage-type fan). Hell, I think overall Petra's is quite expensive I ordered all the gear for my w/c setup from Jab-Tech and it priced out to approximately 10-15% cheaper overall as compared to Petras. I'm trying to pass on friendly advice, not market the place. There are numerous other threads on XS detailing what I'm talking about. It seems that with Petras you always get genuine YL, with others it can be a lottery. Very high quality, you can feel it when you pick them up and mount. That said, they are very loud, and will be undoubtedly. Not that he necessarily is the least biased, but he has an extremely good reputation at XS and his reports are also corroborated with the photos of many fans bought from Petras versus those failing from Jab-Tech and other places. Gentle Typhoons may be slightly quieter but these are the best cheap high speed fans around. The D12SHs feature a massive airflow rating, pulling almost 130cfm (Two times that of my SickleFlows). The reason I keep saying this is because Alex (who you can call yourself, his number is on Petra's site) has verified that after all these reports (like I posted above) on XS about inconsistent YLs that Petra's is the only US reseller that buys straight from the YL factory. The Yate Loon D12SL-12 on the other hand is slightly noisier than the the Noctua 12v, but at 7v they sound pretty much on par. I work for an independent global adviser focused solely on hedge funds in CT. The NF-P12 certainly has the goods and it performs well whilst being almost totally quiet. Have any of you experienced any similar issues with Yate Loons having a short life span? I know they're fairly cheap.so maybe this is a situation of "You get what you pay for" with regards to lifespan. I also have Scythe and Panaflo fans in my case, both which have been running for just as long as the Yate Loons (if not longer), but neither have exhibited any problems thus far. Each time, a quick diagnosis reveals that this hum is coming from one of my Yate Loon fans I'm not sure of the exact cause, but putting a slight amount of pressure on the middle/motor section of the fan silences the hum (it is VERY audible from anywhere in my room otherwise), so maybe it's the motor going? So far I've had to replace an intake fan and both fans on my radiator (actually the 2nd one on my rad is silenced by a strategicly placed 12V battery which silences the hum until I order another Scythe S-Flex fan). It seems as though every few months, I'll get this horrible humming noise coming from my case. The Yate Loon and Noctua fans were also tested for air flow when installed on the airtight test chamber by using the calibratable digital Anemometer to record the air flow after it had passed through the cooling fins of the radiator.Over the course of the past year or so, I've bought half dozen or so Yate Loon fans (D12SL I believe). Power for the testing phase was provided by a variable power supply, and the voltages checked using a digital test meter. Each time, a quick diagnosis reveals that this hum is coming from one of my Yate Loon fans Im. It seems as though every few months, Ill get this horrible humming noise coming from my case. I have chosen to test the fans at these three voltages due to the increasing number of people undervolting fans in the name of silence. Over the course of the past year or so, Ive bought half dozen or so Yate Loon fans (D12SL I believe). The Yate Loon and Noctua fans were tested for free air flow capacity using a calibratable digital Anemometer, upon which they were allowed to run at 5v, 7v and 12v respectively. A unique feature (at least of the XSPC fans) is that the heatshrink tubing starts inside the hub, crosses the strut and extends more than an inch beyond the frame, perhaps more than 30mm. So please bear in mind that when you see the static pressure graphs on the next page, that when a fan shows '0' static pressure it is actually between 0.0 cmH20 and 0.099 cmH20. Xinruilian (at ) also sells these fans with ball bearings. Currently this is all my review budget allows for at the moment, but I will be upgrading my Manometer in the near future to a better model. However, the digital readout only records to 1 decimal place which makes the results relative in the grand scheme of things, but fails to provide an exact amount of static pressure i.e to two or more decimal places. #Note: The digital Manometer that I have used for todays testing is accurate to +/- 2%.
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