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Title: Dark color spots on pcb of GTX1070 Post by: SidETH on November 23, 2017, 04:39:16 PM 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? ???
Normal card: http://www.fotothing.com/photos/202/202263e1b47b5057051120c0bc8248b0_895.jpg And the one with the dark color spots: http://www.fotothing.com/photos/6a3/6a35765b142a14f7b125ec76b887ebb7_bbb.jpg Title: Re: Dark color spots on pcb of GTX1070 Post by: dagarair on November 23, 2017, 04:43:07 PM normal. Happens with heat
Title: Re: Dark color spots on pcb of GTX1070 Post by: bigjee on November 23, 2017, 04:45:20 PM 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. Title: Re: Dark color spots on pcb of GTX1070 Post by: RentGPU on November 23, 2017, 04:47:30 PM It reminds me as a capacitor leaked oil , do you clean this cards frequently?
Title: Re: Dark color spots on pcb of GTX1070 Post by: gt_addict on November 23, 2017, 04:53:48 PM 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.
Title: Re: Dark color spots on pcb of GTX1070 Post by: Bazzaar on November 23, 2017, 04:58:07 PM 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? Baz Title: Re: Dark color spots on pcb of GTX1070 Post by: SidETH on November 23, 2017, 05:07:06 PM 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. Title: Re: Dark color spots on pcb of GTX1070 Post by: bigjee on November 23, 2017, 05:18:38 PM 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 https://s17.postimg.org/xcpctfibz/Capture.jpg Title: Re: Dark color spots on pcb of GTX1070 Post by: SCSI2 on November 23, 2017, 06:46:09 PM Silicone oil bleeding from thermal pads. Very common and mostly harmless.
Title: Re: Dark color spots on pcb of GTX1070 Post by: SidETH on November 23, 2017, 09:54:41 PM Fun fact ;) The first 5 are from the same order/store, the 6th 'bleeding' one was bought a couple of weeks later from another store.
Title: Re: Dark color spots on pcb of GTX1070 Post by: gt_addict on November 23, 2017, 10:15:31 PM Fun fact ;) 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. |
