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Buzzing Corsair AX1200i scares the blank outa me.

post #1 of 14
Thread Starter 
Good god why does it buzz!? (probably gonna send it in if I can't figure it out)(and if it turns out it is something else... f-)

Occasionally even when it isn't under load the PSU buzzes, there aren't any changes in usage and some times goes for a minute or so but then it goes away. The first thing I noticed is when my Corsair Link stopped working. I shrugged it off as just a software thing. Then late last year it buzzed for less than a few seconds but it caught my attention, it didn't happen again until last month when it buzzed on start up. Now the buzz happens at least once a day and is getting longer. Gives me the hebejebes when my monitor turns off because of computer idle.

Now here's the kicker, I'm not 100% sure it is the PSU (like 80% sure). The sound is a high enough frequency I can't pin point it but it is an electrical buzz. I say it is the PSU because that was the biggest (most expensive) change in my rig I've made.

I overclock, but I don't get crazy, like volt mods and 1.5 V on the CPU, and it happens even on stock. No black screens, no artifacting, no random shutdowns, no sudden crashes, when I lag its either graphically demanding, testing an overclock, or I have a really high ping. One thing that has always happened is that sometimes it takes a couple tries to start up, but that happened even on a different PSU.

Another thing to note a couple of my Sabertooth P67's temperature sensors some times get weird, like -C or 0. I also run 12 fans and two water pumps mostly on my Scythe Fan Controller (6) or on Molex (5)(both pumps). I use an expensive power strip that only my computer and monitor use and it is plugged into one socket and that socket only has that power strip in it. Because I use headphones I don't care about the fan noise but that buzz cuts right through it.

There it is, all on the table, more info on my rig is in my sig.
Edited by EchoTwoZero - 3/17/14 at 3:42pm
post #2 of 14
try to see if the sudden buzzing starts when a certain appliance starts , like a toaster oven, or hot water heater. these sometimes cause some phase shifting and a higher DC current to saturate the AC line. is it a 60 cycle hum (lower freq.) or higher freq?? higher means the distortion is after the opamp in the psu, pc psu's are of the "switch type" power supply and run at high freq threw a step-up transformer. it could be some feedback in the psu itself (indicating poor capacitors or inadequate inductors for certain loads), however not usually lethal to the unit itself. I would do some investigating first, next time u hear the hum pay attention to what appliance just turned on(if any), or have some one turn suspect items on and ofwhile you sit and listen at ur pc.
post #3 of 14
the interference in the AC line could also be coming from some one elses home on the same transformer on the utility pole as you, and it could sound like it is worsening over time due to the lamination in the core of the transformer itself loosening up, causing further resonance.
post #4 of 14
Thread Starter 
Quote:
Originally Posted by GregoryD View Post

the interference in the AC line could also be coming from some one elses home on the same transformer on the utility pole as you, and it could sound like it is worsening over time due to the lamination in the core of the transformer itself loosening up, causing further resonance.

The first few times I heard the buzz I was in a different location, and after tinkering around with my rig and running a few electronics around the place (big tv, microwave, laundry machines) I can't get it to buzz consistently. I haven't seen my problem anywhere else online but I did see on Newegg a bunch of reviews talking about AX1200i's dieing and there being a huge waiting period on RMAs with a timing that coincides with right after I bought my AX1200i.

As for the frequency it reminds me of an elecrical fence or this but with the sound just a bit harsher.
Edited by EchoTwoZero - 3/17/14 at 6:13pm
post #5 of 14
Coil whine is my first thought, never heard it myself though.
post #6 of 14
Thread Starter 
Quote:
Originally Posted by ZephyrBit View Post

Coil whine is my first thought, never heard it myself though.

My 570s do have some coil whine but it is much more subtle and increases and decreases with graphical demand. This buzzing is sudden, steady, and constant. It hadn't occurred to me that a PSU could have coil wine.
Edited by EchoTwoZero - 3/17/14 at 6:19pm
post #7 of 14
My Antec HCP 850 had coil whine and so does my seasonic platinum 1000 its not noticeable but it's there. My 780 ti's also make a coil whine only when i put load onto them.
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post #8 of 14
the coil is the transformer, there are also inductors (toroid's) which could also resonate at a very very specific freq.... the clock may smooth out under a load eliminating the whine/buzz. the only thing I can think of being an elec engineer causing the buzz inside a switch type psu would be the opamp and or timer oscillating at a freq that matches the resonant freq of the transformer. whe a load is increased or decreased the logic circuit varies the duty cycle (freq) to the transformer to either increase out put or decrease out put depending on load, could be that at certain loads the transformer is put threw a cycle that matches its resonant freq.

just for knowledge purpose, every transformer hums, its nature of the beast. when an ac current is run threw any coil there is a mechanical vibration that hums to the freq of current passing threw it, the trick is when designing a transformer you want to do your best to make sure its resonant freq is out of range of what ever sweep of freq (duty) it is going to be expected to operate at.

unfortunately man this is a tough one, predicting exactly what component is failing ( if any) that is causing the distortion is all but impossible to diag without opening it up and going threw it with diag equipment. I would listen to your gutt. threw your research you have already determined the unit is prone to this kind of failure, and signs are pointing to this being the culprit. either replace the unit or wait for it to die. I wish there was something I can do to help but all any of us can do is speculate.
post #9 of 14
Thread Starter 
Man, I'm just gonna wait it out, it's gone back into "stealth mode" and has stopped buzzing even under load. Freaks me out. If this kills my rig I'm gonna be so miffed, but part of the reason that I bought it was the crazy long warranty (seven years).
post #10 of 14
Op, I'm guessing you're using only four PCI-E connectors for the 570s.
If you feel like killing time, swap out the 8-pin connectors for the 570s with the unused connectors on the PSU and check.
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