fifo Posted May 26, 2014 Share Posted May 26, 2014 My ax760 is making a sort of high pitch buzzing noise sounds like the noise you hear from the small power substations on the street except ita more higher pith then the lower pitch transformer hum. The fan is in hybrid mode on not turning. I removed the psu from my case Put my ear against it to verify the source of sound then powered the pc. It is definitely coming from the psu. The buzzing noise seems to vary with load. When the pc is powered off the buzzing goea away. What could this be? Link to comment Share on other sites More sharing options...
Corsair Employees jonnyguru Posted May 26, 2014 Corsair Employees Share Posted May 26, 2014 This is what they call "coil whine". One of the magnetics (coil, transformer, etc.) is vibrating within the human ear's frequency range. Link to comment Share on other sites More sharing options...
fifo Posted May 26, 2014 Author Share Posted May 26, 2014 So is this a cause for concern. How come it varies with load? Would it get wven louder at different loads? Link to comment Share on other sites More sharing options...
JKeifer Posted May 26, 2014 Share Posted May 26, 2014 A new species of bee, the Apoidea Corsairia, has taken up residence in your power supply. Just kidding, and I don't mean to make fun of the problems of other, but there surely seems to be quite an infestation of these buzzing supplies. I would have thought by now they would have all been weeded out by one means or another. Link to comment Share on other sites More sharing options...
fifo Posted May 26, 2014 Author Share Posted May 26, 2014 So is this a cause for concern. How come it varies with load? Would it get wven louder at different loads? Link to comment Share on other sites More sharing options...
JKeifer Posted May 26, 2014 Share Posted May 26, 2014 It's not a cause for concern if you can tolerate the noise. Coil whine is not an indication that the component is failing. And, yes, the whine can and does vary with load and even temperature of the "offending" device. Link to comment Share on other sites More sharing options...
fifo Posted May 28, 2014 Author Share Posted May 28, 2014 Anyway i have raised an RMA and was offered the Axi series as a replacement. Now from what i a have read on forums the AXi series has MUCH less occurrences of coil whine, in fact most of the reviews of coil whine i read they seem to be from the non i versions. Why is this? One of the things i don't like about the Axi versions is the loud fan spin up at start up. The Corsair RM750 on the other hand also has a digital link and DSP but the fan does not ramp to full speed at start up, also it has a much quieter Corsair NR135L fan that uses rifle bearings, i wonder why corsair didn't use this fan in the AXi series. Even if corsair used the Yate loon D12BM-12 (max speed of 1700 rpm) it would have been better than the Yate loon D12BH-12 which has a max speed of 2300rpm which is why you get a loud woosh at startup. I do understand that the fan is ramped to full speed to calibrate the max fan speed to 1500rpm.But as the psu only drives the fan at a maximum of 1500 rpm so the 1700 rpm version would have been perfect. Link to comment Share on other sites More sharing options...
Corsair Employees jonnyguru Posted May 28, 2014 Corsair Employees Share Posted May 28, 2014 Anyway i have raised an RMA and was offered the Axi series as a replacement. Now from what i a have read on forums the AXi series has MUCH less occurrences of coil whine, in fact most of the reviews of coil whine i read they seem to be from the non i versions. Why is this? Because the AX is made by Seasonic. One of the things i don't like about the Axi versions is the loud fan spin up at start up. The Corsair RM750 on the other hand also has a digital link and DSP but the fan does not ramp to full speed at start up, also it has a much quieter Corsair NR135L fan that uses rifle bearings, i wonder why corsair didn't use this fan in the AXi series. RM is not digital and does not have DSP. Link functions work via an analog to digital converter. A rifled bearing fan is quieter than a DBB fan, but a DBB fan has a much longer life. Link to comment Share on other sites More sharing options...
fifo Posted May 28, 2014 Author Share Posted May 28, 2014 So this coil whine issue mainly affects seasonic units. I thought the seasonic is best build quality for psus. Secondly in the axi version i don't why understand why corsair didn't used the Yate loon D12BM-12 (max speed of 1700 rpm)it would have been better than the Yate loon D12BH-12 which has a max speed of 2300rpm which is why you get a loud woosh at startup.*I do understand that the fan is ramped to full speed to calibrate the max fan speed to 1500rpm.But as the psu only drives the fan at a maximum of 1500 rpm so the 1700 rpm version would have been perfect. Link to comment Share on other sites More sharing options...
Corsair Employees jonnyguru Posted May 28, 2014 Corsair Employees Share Posted May 28, 2014 So this coil whine issue mainly affects seasonic units. It's more predominant with those than others, but any unit from any manufacturer can potentially whine. Typically with the Seasonic units it is in the +5VSB circuit. I thought the seasonic is best build quality for psus. Excellent quality? Absolutely. "Best"? No. Seasonic is not quite Flextronics, Delta, Lite-On, Chicony quality yet. And coil whine is not a sign of lack of quality. >>ALL<< magnetics can potentially whine. Just whether or not it is in the audible range is what makes people want to complain about it. Secondly in the axi version i don't why understand why corsair didn't used the Yate loon D12BM-12 (max speed of 1700 rpm) it would have been better than the Yate loon D12BH-12 which has a max speed of 2300rpm which is why you get a loud woosh at startup.*I do understand that the fan is ramped to full speed to calibrate the max fan speed to 1500rpm. But as the psu only drives the fan at a maximum of 1500 rpm so the 1700 rpm version would have been perfect. I'm sure there's a perfectly good reason, but I'd have to ask the engineers about it. Link to comment Share on other sites More sharing options...
fifo Posted May 29, 2014 Author Share Posted May 29, 2014 Could it be that because the i version is digital some of the functions are performed by the dsp thus removing the need for some analog components in the +5VSB thus reducing the occurence of coil whine. Just a Hunch really. Any way i would be interested to know why corsair didn't use the Yate loon D12BM-12 but used the D12BH-12 instead. Thus i would appreciate it if you could ask the engineers. Thanks for your help. Link to comment Share on other sites More sharing options...
Corsair Employees jonnyguru Posted May 29, 2014 Corsair Employees Share Posted May 29, 2014 Could it be that because the i version is digital some of the functions are performed by the dsp thus removing the need for some analog components in the +5VSB thus reducing the occurence of coil whine. Just a Hunch really. Yes and no. That's part of it, but there's more to it like how tight the final winding of the magnetics... or in a lot of cases the last layer of the foil of the capacitor. A lot of times, nothing more can be done but to glob on caulk to dampen vibrations that can't be addressed any other way. Any way i would be interested to know why corsair didn't use the Yate loon D12BM-12 but used the D12BH-12 instead. Thus i would appreciate it if you could ask the engineers. The query is out there. All we can do is wait. Link to comment Share on other sites More sharing options...
fifo Posted May 30, 2014 Author Share Posted May 30, 2014 OK, Can the Axi 760 DSP firmaware be updated via the link software like how you can update the firmware of hard drives/SSds via a PC software. Link to comment Share on other sites More sharing options...
Corsair Employees jonnyguru Posted May 30, 2014 Corsair Employees Share Posted May 30, 2014 Technically, yes. But no interface, physical or otherwise, was ever created to do so. At the time, they didn't feel the need to update the DSP. Future versions of AXi will likely allow updates, but that's so far down the road. Still waiting for a reply about the fan choice. Link to comment Share on other sites More sharing options...
fifo Posted June 2, 2014 Author Share Posted June 2, 2014 OK, I currently have some AX760 cables in my case connected to the motherboard and hard drives etc. Can i use these AX760 cables with the Ax760i psu? I saw an ax760i review on you tube and the guy said that the ax760 cables are compatible with ax760i (digital version). But i really wanted to make sure before doing so, so i thought i'd better confirm it with you as you are the PSU GUY at corsair. secondly i was told by corsair technical support that the fan ramps up to full speed until the pc has finished POST, which is why on some computers the fan spins longer than others. But How does the psu know that the PC has completed POST? There is no comms between the psu and motherboard at that point. Link to comment Share on other sites More sharing options...
Corsair Employees jonnyguru Posted June 2, 2014 Corsair Employees Share Posted June 2, 2014 The cables are the same for all new PSUs (RM, AX Platinum, AXi). Link to comment Share on other sites More sharing options...
Corsair Employees jonnyguru Posted June 2, 2014 Corsair Employees Share Posted June 2, 2014 Ok... The answer to why they use the fan they use: Because the fan WILL spin faster if it had to. It's overhead for higher ambient temps. Link to comment Share on other sites More sharing options...
fifo Posted June 3, 2014 Author Share Posted June 3, 2014 Thanks for that! I thought the fan controller at max 100% could only make the fan go up to 1500 RPM? Regarding the cables for the Ax760 and Axi760, Are the lengths and no of cables you get with the ax/axi psu different or for example a 24 pin or PCIE cable on the AXi would be the same length as the AX 760. Why aren't the cables marked Ax/Axi 760 - 860 which would be more clear of their compatibility. I suppose the Axi series cables are probably labeled axi760 - axi1200. Its a good job i don't have to remove my Ax760 cables when i fit the Ax760i psu. Any way i have a question regarding the Corsair link fan control. I want to know: If you set the Psu fan mode to quiet or balanced mode or even specify a fan control profile, will the software send the whole profile to the psu such that you can close the link software afterwards and the psu will still be controlling the fan based on your custom fan profile whiles its switched on. Alternatively does the software do all the monitoring of temperatures itself and checks whether the temperature has exceeded one of the temperature points in your custom fan profile and then the software sends the psu fan a PWM/RPM value, in which case if the user closes the application or if the application freezes or crashes the psu fan speed will not be updated (Not Safe)? I hear that in the new AX1500i corsair have used their own quite corsair fan with hydro bearings (not Yate loon) see review below. They probably even got round the loud fan noise at startup. http://www.guru3d.com/articles_pages/corsair_ax1500i_psu_review,4.html Now this seems like a real decent PSU 80+ Titanium 94 % efficient Cool, Are they going to revamp the Ax760i/860i to 80+ Titanium at some point? Link to comment Share on other sites More sharing options...
Corsair Employees jonnyguru Posted June 3, 2014 Corsair Employees Share Posted June 3, 2014 Thanks for that! I thought the fan controller at max 100% could only make the fan go up to 1500 RPM? It's a fail-safe. If ambient temps hit upwards of 50°C, the fan will kick in full speed. Regarding the cables for the Ax760 and Axi760, Are the lengths and no of cables you get with the ax/axi psu different or for example a 24 pin or PCIE cable on the AXi would be the same length as the AX 760. The lengths of cables and number of cables are the same. If you set the Psu fan mode to quiet or balanced mode or even specify a fan control profile, will the software send the whole profile to the psu such that you can close the link software afterwards and the psu will still be controlling the fan based on your custom fan profile whiles its switched on. You can close Link and the PSU will maintain the setting, but you lose that setting when you reboot. Alternatively does the software do all the monitoring of temperatures itself and checks whether the temperature has exceeded one of the temperature points in your custom fan profile and then the software sends the psu fan a PWM/RPM value, in which case if the user closes the application or if the application freezes or crashes the psu fan speed will not be updated (Not Safe)? All temperature monitoring, etc. is done by the PSU itself. Link is only reporting it. So even if you close Link and temperatures rise, the fan still knows what to do. I hear that in the new AX1500i corsair have used their own quite corsair fan with hydro bearings (not Yate loon) see review below. They probably even got round the loud fan noise at startup. http://www.guru3d.com/articles_pages/corsair_ax1500i_psu_review,4.html Now this seems like a real decent PSU 80+ Titanium 94 % efficient Cool, Are they going to revamp the Ax760i/860i to 80+ Titanium at some point? Eventually. Maybe in another year. Link to comment Share on other sites More sharing options...
fifo Posted June 3, 2014 Author Share Posted June 3, 2014 Thanks for clarifying things. Your a star. Does the ax1500i have the fan ramp up at power up for 2 seconds Like the ax760i/860i? If so what is the max speed the fan ramps to? I look forward for the ax760i titanium versions I take it the 94% efficiency could only be accomplished by the use of the DSP. Link to comment Share on other sites More sharing options...
Corsair Employees jonnyguru Posted June 3, 2014 Corsair Employees Share Posted June 3, 2014 Yes. 2000 RPM for 5 seconds. Link to comment Share on other sites More sharing options...
fifo Posted June 3, 2014 Author Share Posted June 3, 2014 I was told by corsair technical support that the ax760i fan ramps up to full speed until the pc has finished POST, which is why on some computers the fan spins longer than others. But How does the psu know that the PC has completed POST? There is no comms between the psu and motherboard at that point? Link to comment Share on other sites More sharing options...
Corsair Employees jonnyguru Posted June 3, 2014 Corsair Employees Share Posted June 3, 2014 The PSU doesn't know the PC has posted. You were told wrong. It's 5 seconds. Period. Link to comment Share on other sites More sharing options...
fifo Posted June 3, 2014 Author Share Posted June 3, 2014 Cheers! Just wondering why some people say fan stays on for 10 seconds while others say 3 seconds. Thanks for clearing that out. Link to comment Share on other sites More sharing options...
Corsair Employees jonnyguru Posted June 3, 2014 Corsair Employees Share Posted June 3, 2014 Because they're not actually timing it. ;): Maybe they're including the spinning AFTER it starts to slow down. It can spin around 500 RPM for another 25 seconds. Link to comment Share on other sites More sharing options...
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