NVIDIA have released beta driver 450.57, and details are here:  https://www.nvidia.com/Download/driverResults.aspx/162107/en-us

I have tested this with Kernel 5.8-rc6, and it compiles successfully, and (so far) appears to run OK..:

………………………………
ld -r -o /home/rgadsdon/NVIDIA-Linux-x86_64-450.57/kernel/nvidia-modeset/nv-modeset-interface.o /home/rgadsdon/NVIDIA-Linux-x86_64-450.57/kernel/nvidia-modeset/nvidia-modeset-linux.o /home/rgadsdon/NVIDIA-Linux-x86_64-450.57/kernel/nvidia-modeset/nv-kthread-q.o
MODPOST /home/rgadsdon/NVIDIA-Linux-x86_64-450.57/kernel/Module.symvers
CC [M] /home/rgadsdon/NVIDIA-Linux-x86_64-450.57/kernel/nvidia-drm.mod.o
LD [M] /home/rgadsdon/NVIDIA-Linux-x86_64-450.57/kernel/nvidia-drm.ko
CC [M] /home/rgadsdon/NVIDIA-Linux-x86_64-450.57/kernel/nvidia-modeset.mod.o
LD [M] /home/rgadsdon/NVIDIA-Linux-x86_64-450.57/kernel/nvidia-modeset.ko
CC [M] /home/rgadsdon/NVIDIA-Linux-x86_64-450.57/kernel/nvidia-uvm.mod.o
LD [M] /home/rgadsdon/NVIDIA-Linux-x86_64-450.57/kernel/nvidia-uvm.ko
CC [M] /home/rgadsdon/NVIDIA-Linux-x86_64-450.57/kernel/nvidia.mod.o
LD [M] /home/rgadsdon/NVIDIA-Linux-x86_64-450.57/kernel/nvidia.ko
make[1]: Leaving directory ‘/usr/src/linux-5.8-rc6’

Robert Gadsdon.   July 20th 2020.