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RF Interference caused by hard drive...

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Re: RF Interference caused by hard drive...

Postby Gary_W » Fri Nov 11, 2011 12:10 pm

Hi Dave,

I wouldn't dream of suggesting that people play with most of the bios settings.

All I'm getting at is that the C1E information is out there already - it's a known fault that affects an awful lot of motherboards out there. IMO, it's worth saying in the sticky 'If you have an X58 style motherboard, it's worth checking the C1E setting in bios'. Whilst I fully agree that most problems will ultimately be a ground loop of some kind, folks with X58 boards like me won't be well served by not being made aware of 'common knowledge' which this is supposed to be.... And the whole point of a sticky is to promote 'common knowledge' in one easy place :)

Gary
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Re: RF Interference caused by hard drive...

Postby dmills » Fri Nov 11, 2011 6:50 pm

Also, for reference if the C1E thing sorts it then almost by definition it has nothing to do with the hard drive as such.....

There may well be a correlation, but correlation is not causation.

I still think you have some funky grounding going on, while I could see poor VRM design doing this to something like a sound card, for it to be radiating that much energy there must be something forming an aerial, or a case panel not making metal/metal contact or something equally tedious.

Regards, Dan.
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Re: RF Interference caused by hard drive...

Postby Gary_W » Fri Nov 11, 2011 9:37 pm

dmills wrote:Also, for reference if the C1E thing sorts it then almost by definition it has nothing to do with the hard drive as such.....

There may well be a correlation, but correlation is not causation.

I still think you have some funky grounding going on, while I could see poor VRM design doing this to something like a sound card, for it to be radiating that much energy there must be something forming an aerial, or a case panel not making metal/metal contact or something equally tedious.

Regards, Dan.

Hi Dan,

Quite agree that there's nowt wrong with the hard drive; it's just that this bios setting does seem to make other components in a system behave in a very odd way! I don't quite get why it could cause such a strange phenomenon but it does :)

The good news is that it gave me cause to check pretty much everything with a fine toothed comb.... A couple of motherboard screws were given an extra 1/4 turn, I tested continuity of all the earth leads and did indeed check that every bit of metal was bonded to every other bit (my test meter hasn't seen this much use in years!) and the mains plug earths were tested back to the earth in the meter cupboard which was well-bonded to the water pipe..... But none of this made a bit of difference to the problem. Obviously nothing is 100% and I cannot rule out the possibility that I've missed something. But I'm 99% that I have not.

If I stick these singal coil pickups right next to the PC I still hear the noises. But I'll bet if I stuck the pickups next to anyone elses computer it'd do the same.... The odd thing here was that the C1E thing almost seemed to boost the power of the noise to a level that screening / ferrites / ensuring a good earth and plugging everything in to a common source just couldn't cope with .....

Also worth mentioning that lots of folks will probably have the C1E set on and not be getting any issues.... If I did not own an electric guitar I would have not had any issue with the default 'on' setting - the noise did not pick up or affect microphone recordings at all and MIDI certainly didn't care. It's just guitars and even then the humbuckers didn't mind it anywhere near as much :)

Gary
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Re: RF Interference caused by hard drive...

Postby Eric Fung » Tue Jul 30, 2019 8:54 am

Gary_W wrote:Many thanks for the reply, Pete. It is very much appreciated.

I am very happy and excited as I have now managed to fix it. :bouncy:

Google showed that quite a few people have had big problems with these boards in terms of noise and the comments at the bottom of this review thread were what sorted it for me.


http://benchmarkreviews.com/index.php?option=com_content&task=view&id=533

I tried Pete's Spread Spectrum turn-offs but there was no noticable difference. The thing that actually solved it was turning off C1 in the BIOS!!!!

I now can pick up the HDD and other electrical noise sounds if I put my guitar < a foot away from the PC. When I'm in normal playing position it's absoultely fine now. This has cured the fault for my external amp and also when using guitar rig via the Saffire.

The overall noise level has gone down on the guitar as well, but the most welcome thing is the lack of HDD spike noise. What a relief to have fixed it!

Prior to finding it, I had actually put a sheet of turkey foil in front of my guitar (from top of neck to the tailpiece) and earthed it. I still got the noise, which was leading me to read up on all of the ground loop articles but still coming up blank.

So whatever C1 actually is, it causes huge RF gremlins with this board and brings out the worst in everything else that is plugged in. The P6X58D-E is apparently not the only board that can be helped out by turning C1 off, but there were enough posts out there about this when I phrased the searches a little differently to show I'm not the only one to have been here!

Thanks again for all who tried to help on this thread - I am so glad to have found it. I was about to pull the trigger on an SSD and that would have helped out but this was a much better solution! :bouncy:

Thanks alot for this post! I just had the same problem. When I assembled a new computer with i7 9700K and ASUS Z390A motherboard, the release of the computer seriously interfered with the guitar and effects, and even the guitar amp beside it. Search for various cases, all said that the grounding problem, but very lucky to find this post, with a glimmer of hope to try to modify C-state for disable, found that the world has returned to quiet.
Thanks again!
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Re: RF Interference caused by hard drive...

Postby Pete Kaine » Tue Jul 30, 2019 3:50 pm

Thanks for the feedback, great to see a thread still helping after all this time! :)
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