Inno3D Gtx 1070 has spare unused 2 pin on the board? What's it for? : r/ nvidia
Inno3D GTX 1070 Ti X2 Specs | TechPowerUp GPU Database
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CF-12915S Video Card Fan For INNO3D GeForce GTX 1070 1070Ti 1080 1080Ti P104-100 Twin X2 Replacement Graphics Card GPU Fan - AliExpress