fifo Posted April 24, 2014 Share Posted April 24, 2014 Hi all, I recently bought an AX760 but unfortunate the fan was sounding like a helicopter with some medium/high pitch sounds (not loud) but you can hear it about 30 cm away from the PC, plus the psu mounts in the front in my case. Anyway i have returned the unit to the retailer and now have the option of either getting the AXi version or the Same AX version again at more or less the same price. Thus i want to ask people's opinions who have purchased the AXi version as to how noisy is the fan, i have heard it has the Yate loon fan instead of the Sans Ace which the non i has. Secondly i have heard from some reviewers that the fan spins at 100 % at start up for 10 seconds. Is this the case? Is it really loud in a quite system? Thirdly the AX760 in hybrid fan mode, the fan turns on at about 70 % load according to your tech specs below. http://www.corsair.com/en/ax760-atx-...ly-modular-psu On the AXi version the fan turns on at 20% load http://www.corsair.com/en/ax760i-dig...ly-modular-psu Why the difference? I thought the AXi version has a DSP hence should be more efficient thus less heat why does it need the fan on at 20 % load where as the non i has the fan on at 70% big difference. I understand that you can change the fan profile with the link software but if you did this and set the fan speed low wouldn't the psu heat up. Is the AXi version with the DSP for improved ripple suppression better quality than the non i version., and can it protect your components a lot more as it has a dsp to shut the psu down if the voltage goes out of spec. I am trying to decide which one to go for? AX is Seasonic and AXi is flextronics. Is flextronics as good as seasonic? Link to comment Share on other sites More sharing options...
Corsair Employee jonnyguru Posted April 24, 2014 Corsair Employee Share Posted April 24, 2014 They come from different factories, have different topologies, different layout and different fans. So you can't make a side by side comparison of the two except for "they're both 760W". I will say that when the AXi fan spins up, it is VERY slow. Only about 400 RPM. You can't hear a thing. The fan in the 760 shouldn't have been too loud. Could've been a bad bearing. The only thing I ever hear is an occasional click of the bearing, but I tend to hear that with all DBB fans. Link to comment Share on other sites More sharing options...
fifo Posted April 24, 2014 Author Share Posted April 24, 2014 Your right. But at start up the fan speeds up to 100% which is 2700rpm on the yate loon fan For a few seconds, it does this to obtain the max speed of the fan (as it varies between fans) to calibrate the pwm input to the fan. This fan noise is what I am worried about, I have read reviewers complain about it. Otherwise I like the axi version. I wish corsair used a sans ace fan that they use on the non I version, it has a good reputation for quietness or used a fan with a max speed of 1500 rpm, instead of using a 2700 rpm fan and driving it at a max speed of 1300 rpm. Then they would not need this pwm calibration at startup. I like the idea of a digital psu its a shame about the startup noise, if it wasn, t for this I would have went for the axi version. Link to comment Share on other sites More sharing options...
Corsair Employee jonnyguru Posted April 24, 2014 Corsair Employee Share Posted April 24, 2014 Your right. But at start up the fan speeds up to 100% which is 2700rpm on the yate loon fan For a few seconds, it does this to obtain the max speed of the fan (as it varies between fans) to calibrate the pwm input to the fan. Yeah.. I know. I'm the one that told you about that. ;): But, to be fair, the fan does not spin up to the fan's maximum spec of 2700 RPM. It spins up to the maximum RPM of the fan controller, which is 1500 RPM. This fan noise is what I am worried about, I have read reviewers complain about it. Otherwise I like the axi version. Is it really an issue? Think about it.. it only spins initially and in most cases is done spinning by the time Windows boots. During 99% of the PC's usage, the fan will be absolutely silent. Will there be a sleeping baby in the room when you turn the PC on? ;): I wish corsair used a sans ace fan that they use on the non I version, it has a good reputation for quietness or used a fan with a max speed of 1500 rpm, instead of using a 2700 rpm fan and driving it at a max speed of 1300 rpm. Then they would not need this pwm calibration at startup. I like the idea of a digital psu its a shame about the startup noise, if it wasn, t for this I would have went for the axi version. The PWM calibration is because the fan control is done using the DSP. It has nothing to do with the fan itself. A different fan would do the same thing in the AXi. Link to comment Share on other sites More sharing options...
fifo Posted April 25, 2014 Author Share Posted April 25, 2014 The things is the psu is mounted in front inside the case and there are slots on the top of the pc case to direct the air from the psu out. Now because the psu is front mounted, i am concerned about the fan noise, plus i have a quiet set up such that my WD caviar green quiet HD is the loudest thing in my case . Another thing that worries me are some of the reviews that say the fan noise at start is loud and lasts for about 10 seconds. Do you have a quite setup, if so how loud is the fan ie. whisper quiet/ wind noise etc. at start up, and how long is the fan speed at 1500 rpm, is it 10 seconds and does this time vary between psu's? secondly according to the review the efficiency of the non i was better at low load than the i version which is a bit confusing, as the i version has a real time DSP. http://www.techpowerup.com/reviews/Corsair/AX760/11.html But the ripple suppression of the i version seems to be better, Am i right in saying that the i version is a much safer psu in terms of protecting your components as it will shut down more quicker than the non i version when the voltages spike out of range? Link to comment Share on other sites More sharing options...
fifo Posted April 25, 2014 Author Share Posted April 25, 2014 I know the sans ace fan is better quality but how does it compare to the yate loon fan. I see that cosair use the yate loon in a lot of their psu's. Is the sans ace quieter than the yate loon, or is the noise/bearing type different? Link to comment Share on other sites More sharing options...
Corsair Employee jonnyguru Posted April 25, 2014 Corsair Employee Share Posted April 25, 2014 I know we've had the conversation about the ripple, etc. and how we could find different reviews with different samples yield different results.... so I won't rehash that. But I certainly wouldn't say the performance of the non-i is unacceptable. It's easy to say that the San Ace is a better fan simply because it's a fan that's been used more than any other and outside of PSUs, but I can personally say six of one, half a dozen of the other. Either can fail, but it's very unlikely either will. I think this is all going to come down to personal preference. If that 10 second spin up is going to bother you, go with the PSU that doesn't have a 10 second spin up. Is it loud? 1500 RPM is noticeable. Do I have a quiet machine? Not really. I have a pair of GTX670's. Nothing quiet about that. It sounds like you're liquid cooling your graphics cards if the HDD is the loudest thing in your computer. So stick with the AX PSU and call it a day. Link to comment Share on other sites More sharing options...
fifo Posted April 25, 2014 Author Share Posted April 25, 2014 Thanks! BTW I have a evga 460 gtx with the reference active cooling fan in the center which is very quiet unlike the turbine type passive cooling fan which you get in later generations. Link to comment Share on other sites More sharing options...
fifo Posted April 28, 2014 Author Share Posted April 28, 2014 Sorry to bother you again, but i have manages to find a video on the AX760i noise profile, and boy its loud, [ame]https://www.youtube.com/watch?v=R6X0iW9vEY0[/ame] people say it sounds like a hair dryer at startup for 10 seconds. I found this quite useful as it gives me an idea of the noise instead of just speculating. Link to comment Share on other sites More sharing options...
Corsair Employee jonnyguru Posted April 28, 2014 Corsair Employee Share Posted April 28, 2014 Actually, that's a HORRIBLE example. First off, that's full load and there's no disclosure of how long it was running at that load and what the ambient temperature in the room is. But that aside... assume that the fan is running at full RPM (which is still only 1500 RPM), look at the guy's noise floor. When the fan in the PSU stops spinning, he's still measurung above 35dB! If you go to the end of the video and you can tell that the microphone is turned up SO HIGH that it's picking up all sorts of buzzing and hissing. Did this same person also test other PSUs using the same methodology? To say it sounds like a hair dryer on start up is a very gross exaggeration. Hair dryers are typically 40dBA. The AXi was tested in a professional sound lab (PAL labs) with a 6dbA noise floor and at full load, 1500 RPM, the fan produces < 28dBA of noise. Link to comment Share on other sites More sharing options...
fifo Posted April 28, 2014 Author Share Posted April 28, 2014 What do you mean by the noise floor? < 28 db max. Do you know what exactly. Link to comment Share on other sites More sharing options...
Administrators Technobeard Posted April 28, 2014 Administrators Share Posted April 28, 2014 Noise floor means that the ambient noise in the room with nothing on, nothing moving, there was only 6 dbA measured. Link to comment Share on other sites More sharing options...
Corsair Employee jonnyguru Posted April 28, 2014 Corsair Employee Share Posted April 28, 2014 Noise floor = the noise in the room before you start measuring whatever your measuring. The AX860i was actually measured at 28.1 dBA, to be exact. That's at 1510 RPM. Link to comment Share on other sites More sharing options...
fifo Posted April 29, 2014 Author Share Posted April 29, 2014 Do you have a sound clip mp3 or video of this noise level. The thing is db values for the same fan will be different by different measuring equipment. Link to comment Share on other sites More sharing options...
Corsair Employee jonnyguru Posted April 29, 2014 Corsair Employee Share Posted April 29, 2014 That's why the video you provided is such a horrible example. I do not have a sound clip. PAL Labs is a third party, ISO 7779:2010 standardized lab. Meaning you can cross reference their findings with other ISO 7779:2010 audio labs as the testing methodology is consistent. If someone does NOT use a standardized lab, your findings are quite random and meaningless. For example: They don't shove a microphone right up to the fan in a room with a 35dBA sound floor. Link to comment Share on other sites More sharing options...
fifo Posted April 30, 2014 Author Share Posted April 30, 2014 I agree! This the thread that describes the noise like a hairdryer. http://forum.corsair.com/v3/showthread.php?p=640517 Link to comment Share on other sites More sharing options...
Corsair Employee jonnyguru Posted April 30, 2014 Corsair Employee Share Posted April 30, 2014 Maybe the guy is used to using very quiet hair dryers? Link to comment Share on other sites More sharing options...
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