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Gtx 980 2 8 pin power connectors question.

Rumils

Member
Joined
Apr 14, 2015
Messages
6
I was wondering. A friend of mine just installed a gtx 980 in his pc and was having problems with coil whine. We figured out he had the 2 8 pin plugs on different levels of the power supply ( there are 4 plugs in total in a 2x2 config) once we changed them both to the same row the whine went away. The gpu are like this for about 6 hours. I was wondering if you guys think this could have caused damage.

This is the powersupply setup. All the power on the left are the 8 pins. One connector was in the top while another was in the bottom.

http://www.hardwaresecrets.com/wp-content/uploads/hs_ZSeries_850w_022.jpg

Thank you in advance.

Also I should add he was getting poor performance prior to switching the connectors.
 
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Master_Shake_

Well-known member
Joined
May 24, 2011
Messages
192
Location
Ontario, Canada
that's an old power supply but according to jonnyguru it is a single rail design....

OCZ Z Series 850W Review

so there isn't different levels of power supply.

strange that you got coil whine with 2 8pins on the same circuit...

you probably didn't cause any damage.
 

Rumils

Member
Joined
Apr 14, 2015
Messages
6
that's an old power supply but according to jonnyguru it is a single rail design....

OCZ Z Series 850W Review

so there isn't different levels of power supply.

strange that you got coil whine with 2 8pins on the same circuit...

you probably didn't cause any damage.
Ok thank you good to know :) Yea not sure why switching which slot the power connector was in made a difference. He was debating buying a new power supply I did test this one before we put in the new card and it was within spec.
 

sweenytodd

Well-known member
Joined
Jan 12, 2014
Messages
361
Location
Kelowna, BC
Different power supplies and GPU combinations are key to coil whine. The noise will not damage the card nor affect the performance overtime.
 

JD

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Jul 16, 2007
Messages
9,115
Location
Toronto, ON
That's an interesting find... makes me curious to try it myself too. Never would of thought of that.
 

choosy

Active member
Joined
Jul 18, 2011
Messages
28
Luck of the draw. But even if it is the same rail it could be the different solder job on the connections to the rail. So it's probably the PSU that does the whine. If you have a spare high wattage card you could try testing those same plugs just to see
 

KaptCrunch

Well-known member
Joined
Feb 23, 2008
Messages
4,079
Location
Ontario
EMF acting on traces taking a different route in PSU

EMF is the main cause of whine

Wikipedia said:
In electromagnetic induction, emf can be defined around a closed loop as the electromagnetic work that would be done on a charge if it travels once around that loop.(While the charge travels around the loop, it can simultaneously lose the energy gained via resistance into thermal energy.) For a time-varying magnetic flux linking a loop, the electric potential scalar field is not defined due to circulating electric vector field, but nevertheless an emf does work that can be measured as a virtual electric potential around that loop.
of magnetic field
 
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