Sptz, can you test the card in another system?
If your system was running fine and stable with your old 1070 in it so it is most likely your used 1080Ti at fault here.
My 1080Ti overclocks/boosts to 2050MHz all day long and 2025-2050 is the average the 1080Ti will clock/boost to with 2100 up being golden chips.
My advice would be to return the card. It is not performing to advertised specs.
If the seller on eBay resists, eBay has protections. Did the seller make any mention the card did not perform as advertised from the manufacture?
Last edited by jonkrmr; 07-16-2019 at 02:33 PM.