I found a good and working tutorial unter http://www.if-not-true-then-false.com/2015/fedora-nvidia-guide/.
Here my notes for Fedora 23 and my GTX980:
# all commands have to be run as root # remove nouceau driver dnf clean all dnf update dnf install kernel-devel kernel-headers gcc dkms acpid echo "blacklist nouveau" >> /etc/modprobe.d/blacklist.conf # append rd.driver.blacklist=nouveau to GRUB_CMDLINE_LINUX in /etc/sysconfig/grub grub2-mkconfig -o /boot/grub2/grub.cfg grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg dnf remove xorg-x11-drv-nouveau mv /boot/initramfs-$(uname -r).img /boot/initramfs-$(uname -r)-nouveau.img dracut /boot/initramfs-$(uname -r).img $(uname -r) # reboot to command line systemctl set-default multi-user.target reboot # install driver bash NVIDIA-Linux-x86_64-358.16.run # follow instructions and choose yes if aksed questions # reboot to gui systemctl set-default graphical.target reboot # install some extra packages dnf install vdpauinfo libva-vdpau-driver libva-utils