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Author Topic: Dark color spots on pcb of GTX1070  (Read 166 times)
SidETH
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November 23, 2017, 04:39:16 PM
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I have an open rig of 6 ASUS GTX1070's running strong since july 2017. No problems with performance differences between the cards, each one running 30 mh/s ethereum at 48 degrees celcius. However, the card on the right outer side has some kind of dark colored spots on the pcb? It looks like grease, but its on the pcb solid, can't get it off. The other cards don't have this. Any ideas? Huh

Normal card:


And the one with the dark color spots:
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dagarair
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November 23, 2017, 04:43:07 PM
 #2

normal.  Happens with heat
bigjee
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November 23, 2017, 04:45:20 PM
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Good question OP. I'd like to know why this happens too.

I have these on my Evga cards (1070 ftw) is totally normal havent seen performance issues at all.
I use iso propyl alcohol with lint free cloth and wipe it off every now and then when I clean my system.

RentGPU
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November 23, 2017, 04:47:30 PM
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It reminds me as a capacitor leaked oil , do you clean this cards frequently?
gt_addict
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November 23, 2017, 04:53:48 PM
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Could be some sort of oil from the thermal compound thats leeched out from the mating face over time. As wih any oil a little bit can travel a fair distance.

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Bazzaar
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November 23, 2017, 04:58:07 PM
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Probably Silicone oil or grease from the thermal interface material that sits between the VRM Mosfets and its heatsink.
Its come from the top side of the board through via holes in the PCB.Looks unsightly, wont cause any problems.
As mentioned, Isopropyl will wash it off.
Or maybe the GPU heatsink paste has been replaced?

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SidETH
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November 23, 2017, 05:07:06 PM
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Thanks for the replies, much appreciated.

The cards are positioned standing up, like most open rigs.
I just blow some dust off them with an airgun every now and then, no cleaning in any other way. Heatsink/compound hasn't been replaced.
Will try the Isopropyl cleaning.
bigjee
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November 23, 2017, 05:18:38 PM
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For sure.
For a while I was thinking it was limited to evga cards that had upgraded thermal pads due to the grease supplied for certain models with back plate. But that isnt the case I guess. (in my rig its only happens on the evga cards lol)

Looking at the guide below you can see it appears on the pcb's as normal.
https://www.evga.com/thermalmod/thermal_pad_mod_installation_guide.pdf

SCSI2
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November 23, 2017, 06:46:09 PM
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Silicone oil bleeding from thermal pads. Very common and mostly harmless.
SidETH
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November 23, 2017, 09:54:41 PM
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Fun fact  Wink The first 5 are from the same order/store, the 6th 'bleeding' one was bought a couple of weeks later from another store.
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November 23, 2017, 10:15:31 PM
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Fun fact  Wink The first 5 are from the same order/store, the 6th 'bleeding' one was bought a couple of weeks later from another store.

Could it be a “refurbished” card then? Could explain why its just that one as it may have been pulled apart for refurbing and the paste changed.

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