Corsair CX750M coil whine

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yamajee

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I just finished up a new setup for gaming mainly. The specs are the following:

Intel i7-6700k

Asus Z170-A Deluxe motherboard

Corsair Vengeance LPX 32GB DDR4 memory

Nvidia 970 GTX omega core edition (yes, bottlenecking the setup I know but it's a time-kill gfx until the 1080 comes out)

240GB Crucial SSD

Corsair CX750M power supply

2TB Seagate HDD



Now the issue is the coil whine and yes it's pretty common in these power supplies however, it only happens when under load. After doing some research and watching some videos, a lot of what I see is the "coil whine" happening all the time whether under load or idle. Mine only seems to start when I start up the game I play (Overwatch for this case). It sounds more like "buzzing" than whining to me, much like when a power cord is about to give out or when the cable is not plugged in properly into a wall socket and so on.. and when it is idle all i hear is a very high-pitched barely noticeable "beep". The question is, is this also a form of "coil whine" and I should just replace it with something else or is there hope for me to fix this?

Thanks.
 
Solution
turkey3_scratch
Yeah, coil whine indeed it seems to me. Contrary to its name, coil whine is usually more of a "buzz" than a whine. Well, no offense, but you sort of cheaped-out on the PSU, so when buying a lower-end PSU of Corsair's options (the RM550x would have been such a better choice) there is less quality control, so it could be that the coils aren't glued down with caulk well enough to suppress the vibrations. Different types of loads also create different types of noises, so that is normal.

Your option is to RMA or live with it.
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turkey3_scratch

turkey3_scratch

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Yeah, coil whine indeed it seems to me. Contrary to its name, coil whine is usually more of a "buzz" than a whine. Well, no offense, but you sort of cheaped-out on the PSU, so when buying a lower-end PSU of Corsair's options (the RM550x would have been such a better choice) there is less quality control, so it could be that the coils aren't glued down with caulk well enough to suppress the vibrations. Different types of loads also create different types of noises, so that is normal.

Your option is to RMA or live with it.
 
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Solution
JackNaylorPE

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1. Don't see any "bottlenecking".

2. The PSU doesn't really fit in with the quality of the remaining components. It's not a PSU I would put in any gaming / overclocking / enthusiast build.

CX750M http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=416
CX750 http://www.hardocp.com/article/2015/01/21/corsair_cx750_750w_power_supply_review/9

Generally the easiest way to resolve coil whine is to switch PSUs. If money is tight and you want a 750, a EVGA 750 B2 will work ($49). The 750 would handle twin 970s, too small for twin 1080s, especially if overclocking.

If you read the second article it details the slide Corsair has taken, the only units Id invest in are the HXi and AXi series ... if they weren't so ridiculously expensive. The newer RMx is a leap ahead of the RM series component wise but even there, the shoddy CWT handiwork gives me concern.

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=452

We have been limiting our choices to the Seasonic X and Snow Silent Series ads well as some EVGA B2 / P2 / G2 units depending on budget.
 
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turkey3_scratch

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CWT seems to have very good quality control. Jonnyguru posted a whole bunch of pics and articles from when he went to China and toured CWT. It was surprisingly a very nice assembly. I could only imagine the horrors of what some places like Huntkey are like. The quality control at CWT is good. The RM550x is an incredible unit, just because it's CWT doesn't make it a poor option.'

Their soldering is usually good. There have been Seasonics with poor soldering. Every company has an off day. Soldering was good on Aris' review of the RM750x http://www.tomshardware.com/reviews/corsair-rm750x-power-supply,4303-3.html

Plus when you see poor soldering, you at least know the company did not cherrypick the unit. It could be that Seasonic picks their best units to send to reviewers.
 
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JackNaylorPE

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On the RM 750x
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=452

CWT's infamous solder bug strikes again... this time confined only to the VRM board, thankfully

ok, I'm going to score the soldering around R37, R40, and R41. To me, it looks like R37 isn't even soldered down on one end. And see that big trace just to the right of that? There's a solder blob stuck to that I was able to scratch off with a fingernail. Nope, CWT, this won't cut it for me. Your pick and place machine needs a talking to. I'm going to break out the iron and fix R37 real quick.
Click to expand...

On the CX750M
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=416

Some of these joints are abysmal, with the PFC parts in particular showing signs of ring cracks. The iron's going to be busy today.

Wait... what the heck is that? Up there, top middle of the shot. Feels loose when I poke at it. Zoom in, please, Mr. Nikon ... Seriously? What looks to be a fragment of the exterior finish of this unit is wrapped around the mainboard. Good thing it's non conductive. Even so, I'm going to need to deduct for that. CWT needs to go have a talk with the quality control guys for sure on this one. At least the solder joints in this area of the board look good, except the one near the upper right with too much solder.

Man, look at that massive solder blob hanging off the red wire lands. This is why CWT isn't on top of the world for build quality yet. ... Wait... sigh. See that orange wire between the modular connectors? Here, let me get a dental pick.

It's abraded down to bare wire, right there. There's a ground wire that looks gnawed on, too. That'll be another scoring hit, though fortunately this is the vsense wire for the 3.3V rail and these two are not really in a position to short out on anything.
Click to expand...


 
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yamajee

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Thank you for the fast responses guys, I didn't really pay attention to this power supply not being made for gaming. I guess I'll be replacing it then but, I'm still seeing coil whine issues from even the hxi series and so on which makes me scared, what I'll probably do is RMA it at the shop I bought it from and have them fit another one themselves, then I'll start up the game and see if there are any sounds before I take it home. That way, I'll shave off endless hours of headaches and troubleshooting.

For this setup and for future upgrades (maybe a twin 1080 SLi setup) what would be the ideal brand, series and watt power supply?
 
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JackNaylorPE

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Id wanan see the tested actual draw of the cards when they hit the market but we have this

http://www.geforce.com/hardware/10series/geforce-gtx-1080

Thermal and Power Specs:
94Maximum GPU Temperature (in C)
180 W = Graphics Card Power (W)
500 W = Recommended System Power (W)3
8-Pin = Supplementary Power Connectors
Click to expand...

So ... at least according to nVidia, 680 watts is just fine .... add 10% for overclocking (36 watts) an you at 716 watts

I have twin OCd 780 that pull about 275 watts each and a 4770k polling about 130 watts, 2 HDs, 2 SSDs, 16 fans and two water pumps 946 watts) , the meter at the wall measures 745 watts at peak load.... that means that at best, the PSU is putting out about 675 watts. The 1080s will obviously be less and I'm guessing we can cross off the pumps ... I don't see your PSU pushing out more than 630 watts or so... in which case I'd suggest a Seasonic 750 Snow Edition

But again, until we see some actual testing, I wouldn't be pulling the trigger. OTOH, I have never seen any PC exceed nVidia PSU recommendation.
 
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yamajee

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Come to think of it, I do have a TX850 laying around, not the new one, the exact same as the one in the pic below:

i.png


You think this would be a better temporary solution to the crappy cx750m ?
 
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turkey3_scratch

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It's still only a single review. To assume that every PSU like this is silly. If you read any recent reviews of CWT units, they are actually being praised for their good soldering.
 
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turkey3_scratch

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It's a better unit period. It'd be better to run the TX850 as the permanent solution.
 
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yamajee

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I did change to the TX850, still hearing a "buzz" but much much better than before. Even though, this power supply was used on the setup I had before, the last time I used it was weeks ago and I'm pretty sure I had no coil whines whatsoever. But now, I'm starting to hear a little bit of buzzing from the graphics card too, lol, I guess I'll just live with it.
 
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yamajee

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Yeah, figured out that I'll just live with it, not worth the headache.


Thank you all for the help, very appreciated.
 
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