DGroves,
The RTX 2080 is rated at 215W/225W (Founders Edition) and the NVIDIA required minimum power supply is 650W.
https://www.nvidia.com/en-us/geforce/graphics-cards/rtx-2080/
As the OP's Z4 G4 has a 1000W PSU, the power capacity is not in question.
BambiBoomZ
