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Motherboard Electrical Buzz / Grinding when Idle

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AMD_Ruthless View Drop Down
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    Posted: 10 Oct 2017 at 2:52am
Hello All

After 2 months my X370 Fatal1ty Gaming Pro died and I had it replaced by the reseller. However, while the new board is working I now hear this annoying electrical grinding noise similar to that of a mechanical drive around the VRM / CPU area. 

Strange thing is I only hear it when idle, or browsing the net. If I watch a video, or even do something like decrypt /encrypt a drive the sound is greatly reduced and is very faint. I did not have this issue with the first board before it died. Obviously this is a choke issue around the VRM. 

I have C6 disabled and tried a bunch of other things too but the fact remains I am using the same BIOS settings as the first board and that did not have this issue whereas the second board does.

Being a first time customer with ASRock and having a board die after 2 months and now this issue with the chokes with the 2nd board is very disheartening.

So, question is should I RMA this second board or is there anything else I can try?

Thanks in advance.....


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parsec View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote parsec Quote  Post ReplyReply Direct Link To This Post Posted: 10 Oct 2017 at 11:49am
Originally posted by AMD_Ruthless AMD_Ruthless wrote:

Hello All

After 2 months my X370 Fatal1ty Gaming Pro died and I had it replaced by the reseller. However, while the new board is working I now hear this annoying electrical grinding noise similar to that of a mechanical drive around the VRM / CPU area. 

Strange thing is I only hear it when idle, or browsing the net. If I watch a video, or even do something like decrypt /encrypt a drive the sound is greatly reduced and is very faint. I did not have this issue with the first board before it died. Obviously this is a choke issue around the VRM. 

I have C6 disabled and tried a bunch of other things too but the fact remains I am using the same BIOS settings as the first board and that did not have this issue whereas the second board does.

Being a first time customer with ASRock and having a board die after 2 months and now this issue with the chokes with the 2nd board is very disheartening.

So, question is should I RMA this second board or is there anything else I can try?

Thanks in advance.....




Inductor/choke noise is normally worse under low current conditions, which is why you hear it during low load situations on the processor. It seems you know that by having C6 disabled. This can also be related to the PSU being used, the low load ripple on the +12V rail, or the +12V rail voltage regulation varying under different loads. That is, the voltage increasing under low load.

You really must have a quiet PC with zero fan noise if you can hear inductor buzz from inside a PC case. Or you are sitting next to the PC.

Electronic components vary in their construction, and can change slightly over time. The inductor noise does not mean the part is bad (although that could be debated about inductors), just that vibration is not being damped in one or more of the inductors. A noisy inductor will still provide the correct electrical specs, but simply make noise at times.

If you would consider this a (potential) fix, using a fixed VCore voltage will tend to apply more voltage to the VRM stage and in turn to the inductors, which may keep one or more of the 16 inductors in the CPU VRM circuit from resonating. High frequency sounds like this can be difficult to pin point, so it could be any inductor, such as one used in the memory VRM circuit.

You could try carefully pressing on each inductor with your finger, to check if it will move a little bit. An inductor that is hovering above the board on it connecting wires/pins might stop buzzing if its body is touching the board.

Have you tried reconnecting the 4/8 pin CPU power cable from the PSU to the board? Are you using a 4 or eight pin connector?

I occasionally hear a little inductor whine when I am shutting down one of my Intel chipset board PCs, just before the PSU main voltage rails are switched off. I had one mother board, actually made by Intel, that had inductor whine when C6 was enabled. Otherwise I've never had a board with noisy inductors.

We have no idea about any of the other hardware in this PC.

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wardog View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 10 Oct 2017 at 8:46pm
Time for the Hot Glue Gun !
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Xaltar Quote  Post ReplyReply Direct Link To This Post Posted: 10 Oct 2017 at 9:31pm
I have not had an ASRock board die on me yet, I won't say it doesn't happen but I have been using them a long time and never had one fail on me. Considering the fact that I have used over a dozen different ASRock boards that is saying something. 

One board dies then the replacement has coil whine, I am going to go out on a limb here and suggest maybe trying another PSU. As Parsec pointed out, excessive ripple on the power rails can cause, or pronounce, whine. To be clear, all inductors whine, typically the sound is so quiet we can't hear it or outside of our hearing range. What happens under load is that the frequency increases thus raising the pitch above normal hearing range. Boards dying after having worked stable for more than a month is rare and usually caused by external influence like bad power, insufficient cooling or excessive humidity. I am not saying this to cover for ASRock here but out of concern for you. Whenever I have boards die on me (or my clients) I always thoroughly troubleshoot all the remaining components. In fact, I often replace the PSU as a matter of course. 

If a different (known good) PSU does not stop the whine then you can RMA. It doesn't mean the board is broken or defective but for some the sound can be unbearable. I believe ASRock is usually good with coil whine claims.  


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AMD_Ruthless View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AMD_Ruthless Quote  Post ReplyReply Direct Link To This Post Posted: 11 Oct 2017 at 2:22am
Thanks everyone for the reply. I very much appreciate it.

I have one if not the best PSU on the market. Seasonic Prime Titanium 1000W. I can try another (my older) PSU over the weekend.

This is also the first time I have had a motherboard die within a few months of ownership in all my years of building.

I have a Kraken X62, Phanteks case, 6 x Noctua fans, cooling is more than sufficient.

I have a very quiet PC and yes I sit next to it so it is easy to hear the noise.

I use fixed vcore @ 1.375v @ 4GHz. I ran also at stock and the noise is there.

I'm using an 8-pin power cable connector for the mobo.


Edited by AMD_Ruthless - 11 Oct 2017 at 2:23am
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datonyb View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote datonyb Quote  Post ReplyReply Direct Link To This Post Posted: 11 Oct 2017 at 6:07am
not nit picking here but

you can also have too large a psu

the power draw can be too low on it causing it to run well out of its efficiancy band

i vote for wardogs solution

a hot glue gun is actually a good call
[url=https://valid.x86.fr/jpg250][/url]

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Xaltar Quote  Post ReplyReply Direct Link To This Post Posted: 11 Oct 2017 at 6:30am
Good point Datonyb, if the PSU is operating below it's efficiency curve it could be causing issues. All PSUs operate best in a band between their rating and, well, off. If you are over or under that band you loose efficiency and potentially pick up ripple etc. 

That said, we don't know the full system specs. An easy way to test if it is under the efficiency band would be to add some extra hardware to the system, more HDDs, fans etc and see if the added load kills the whine.

If you do go the hot glue route, don't tell us here in-case you ever need to RMA again Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ivan_83 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Oct 2017 at 10:04pm
Disable C6 glob states in bios.
If not help also disable qool&quiet.
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AMD_Ruthless View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AMD_Ruthless Quote  Post ReplyReply Direct Link To This Post Posted: 12 Oct 2017 at 10:21pm
Hello Again

I have no experience with the hot glue method and a little apprehensive to start "drop it like it's hot"......

@Ivan, tried both. Having both disabled made my CPU go full load during Idle at random times which made it slow down. I have since re-enabled Q&C and left C6 off.

I may just keep things as they are for 6 months and upgrade the mobo and CPU next year during the Zen refresh.

Cheers.


Edited by AMD_Ruthless - 12 Oct 2017 at 10:22pm
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datonyb View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote datonyb Quote  Post ReplyReply Direct Link To This Post Posted: 12 Oct 2017 at 10:23pm
hot glue =

its a stick of glue you shove in a heating gun and it squirts out the end runny and sets hard

quite handy for dads with kids Smile

what wardog suggests is to squirt a bit around the base to stop any undue resonance
[url=https://valid.x86.fr/jpg250][/url]

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