Thanks for sharing Dancop!
I can confirm the XOC bios works well even on a Gigabyte G1 and gained about 30mhz over stock bios. For some reason the memory speed downclocks from 12,000 Mhz to 11,000 Mhz during GPUPi 1B. I also tried to force 12,000 Mhz using ThermSpyPremium as mentioned by @elmor in the ASUS GTX 980 Ti Matrix thread and no go.
marc0053`s GPUPI - 1B score: 16sec 178ms with a GeForce GTX 1080