I had some trouble once I’d installed steam. It would fail to find the swrast driver. After some searching I found that the following command pulled through the required libraries:
sudo dnf install xorg-x11-drv-nvidia-libs.i686
This didn’t work quite so well on Fedora 23 so try this…
sudo dnf install nvidia-driver-libs
or use yumex-dnf to install nvidia-driver-libs.