Overclocking
The innate problem for anyone designing a high-performance heatsink and custom PCB for the GTX 1080 Ti is that the frequency ceiling is dictated more by the Pascal architecture's unwillingness to scale much higher. Everyone who has a custom card runs into this wall, almost irrespective of cooling prowess.
Without touching the voltage we managed a stable boost speed of 1,950MHz and memory at just over 12Gbps.
We had expected a little more performance, but it still tops the charts in an overclocked state.